Psi,
Well the 9 ghouls are alreaady in S2, so I upgraded them to Ghasts. They're are wearing amulets that prevent them from being turned or destroyed, which should certainly upgrade their CR a little bit.
Did I expect them to accomplish much? No, but you'll recall that I have upgraded the module to 12th level, meaning that a few lower level encounters will be thrown in as well. These easier threats
should sap some of the parties resources if they are also facing other more challenging opponents during the same adventuring day.
Monster AC scores all going up? Not necessarily, it looks like a few monsters got downgraded a bit.
Take your friend the Orc, you know the guy with the pie
3.0 saw him w/ AC 14, a +3 AB doing d12+3 in defense of his beloved pie, though w/ a mere 4 hp, he's probably All Offense
3.5 he now sports an AC 13, a +4 AB doing 2d4+4 damage with his dreaded falchion (can anyone imagine an Orc pronouncing the word falchion? Too many syllables) he does get an upgrade to 5 hps.
Actually this isn't that bad of a change IMO. That d12 + 3 was an absolute killer for 1st level dudes.
There are other examples of course, but that's just the 1st one that pops into mind. It just seems like a lot of the improvements were just a bump in hp & maybe a bit more damage potential.
Merric B,
Yeah, that's probably about right, but it seems like more hp improvements than AC improvement. Take the Ogre for example (while we're in the O's). He gets +3 average HPs(from Toughness) w/ no change to AC or AB. He does do 2d8+7 rather than 2d6+7. Init is still crap and AC is unchanged. He's CR 3 now rather than CR 2 probably because of the damage potential, but that seems a bit much.
ymmv