I see the problems with this thread.
1. No pc should be expected to hit a soldier 6 levels higher than they are. That is simply a dm mistake
2. You seem to absolutely have to have a houserule. This is the Rules section, meaning we will try to explain your problem or fix it with the allowed rules rather than give you house rule section.
My thought is the same as others.
1. Rogues have higher to hit than others, including monks, they lose out against monks in the areas of choosing the defense they attack and mobility.
2. Luck can do wonky things (however if you throw +6 soldiers at the party, this just no longer matters.)
Coming into a forum with a problem with your game, and not having the solid numbers on the situation (chance to hit on problematic encounters, number of times rogue has hit over the monk.) and then using anecdotal evidence to decide a house rule is utterly necessary is misguided.
Okay, my bad- I'll live with that.
However I've been throwing +6 level creatures at the party for the best part of 6 months, and we've had no problem so far.
So let me go and search out the numbers, you've gotta remember here I play pretty much in isolation, I play via Maptools because I can't get a 4e game or group for love nor money in Grimsby. Believe me I've tried.
So I've no idea if other people are having the same experience or not- which was initial enquiry, alongside how to fix it.
I'm not sure what info you need but here goes-
For an At Will Power for the Players in game at present-
Fighter #1 +17 vs AC
Fighter #2 +17 vs AC
Cleric +16 vs AC
Assassin +15 vs Fort
Mage +15 vs Ref
Monk +14 vs Ref
Which seems to be okay, sure he's on the bottom rung of the ladder but...
Part of the problem is perhaps the Rogue which he replaced was at the top of the ladder-
Rogue +18 vs AC
Last fight was in the Pyramid of Shadows-
Charnel Lord 15 Elite Soldier AC/F/R/W 30/32/26/29
Over a dozen Charnel Rats 12 Minions 26/23/26/25
And throw in a Level 12 Elite Obstacle (Trap)
Anyway 6075 XP Level 14 Encounter
They wiped the floor with it- five rounds, lots of bloodied, a daily or two got used but they all kicked ass- save the Monk, who failed to hit, sure he was in a pit with the Otyugh but so were three of the others.
Fight before that
Gharash Vren, Dragonborn Soldier Level 15 Soldier 32/27/24/27
3x Human Archers Level 12 Artillery 24/23/24/22
3x Human Outlaws Level 13 Soldiers 29/26/25/24
And a Level 13 Elite Blaster Trap
Total 7300 XP Level 15 Encounter
Guess what, five rounds to rip apart, although Gharash surrendered when he was bloodied and the last bad guy standing.
I've thrown Level 17 encounters at the group (3 of them to be exact- I keep copious notes down to every last XP point I've dished out, every creature they've met and interacted with, or simply fought and/or vanquished- an Excel spreadsheet with lots and lots and lots of info- I'm a Higher Education (Degree/Masters) level lecturer by trade with +10 in anally retentive).
So sorry for not having the data to hand- I was at work for the other posts.
So in game we've had a number of other players/classes during the campaign; I think we've been through-
1 Cleric, 1 Barbarian, 1 Druid, 1 Monk, 1 Assassin, 1 Paladin, 2 Wizards, 3 Fighters and 3 Rogues.
Each time a new player and/or PC joined then there's always a transition period, getting used to powers, new character, new tactics etc.
But the Monk is giving us real problems that we've not encountered with any of the above.
As I say for four sessions 20+ hours play then he hits 25% of the time- now that might be a mixture of bad luck, poor choices, bad play etc. But it's getting to be worringly consistant, last session four combat encounters and he hit once.
The players are mostly veterans of the game, including the Monk player, he's been in the campaign almost from the beginning, which is 59 sessions old, we know each other- the players help each other out, particularly the Monk as in-game he's such a nice fellow, particularly compared to the players previous incarnation the Rogue who was an out-and-out bastard, and a killing machine.
So I just thought I'd ask if other people had encountered the same problem, the encounter difficulty level hasn't spiked- it's been a steady gradient all along, the players have always been ahead of the curve, hence tougher encounters.
Also we House Rule damage, the PCs do an extra Half Level on a hit, that's just because we play via Maptools and the communication is not always great with peoples lives going on around them (kids, cats, wives etc.). Therefore we want to get through the combats a little quicker.
I also play the monsters according to their Int, so the rats try to scarper and give AoO etc. as do less bright creatures on occasion which leads to lots of AoO (Marked) from the Fighters. As I say we want to get through the combat in good time, it still takes between 40 mins and an hour though- once again Maptools and Skype are issues.
Thanks for helping.
PS I'm an excellent DM, or at least the players seem to think so, they also keep asking if their mates can join the game. I map everything for Maptools, find lovely images, do daft voices, type up all the conversations onto macros et al, same room descriptions- and generally organise everything. Sure I make mistakes, all the time, but at the moment I can't see what's going wrong- unless it is just bad play, bad luck etc.
There have been a few Level 16 bad guys but on reflection not as many as I thought when I was at work, now I have the data, there have been lots of level 15 creatures however.
Cheers Paul