Lanefan
Victoria Rules
You have it backwards: you divide the total monster "levels" by the total party levels. If the result is 1 or higher, then full ExP. If lower, the calculated ExP total gets reduced by the same ratio.
More often than not, the resulting adjustment is relatively trivial...trivial enough to not even bother with it. And if the party's superiority is that significant, you'll notice this during the battle itself and can adjust on the fly - a simple note "2/3 ExP this battle" for later reference will do.
And with that said, if the party's superiority is that great then giving full ExP for the encounter isn't going to mean a thing anyway. I mean, really: if you need 100,000 ExP to get to your next level, who cares if you get 22 or 44 for taking down a couple of Kobolds; or 100 vs. 200 for taking out a 22 h.p. Ogre. Again, it comes down to "why bother?".
Oddly enough, in this particular example the problem neatly solves itself.
Let's say (for ease of arithmetic) those Ogres each had 22 h.p. Appendix E shows an Ogre being worth 90 + 5/h.p., so these'd be 200 each; 3 of 'em makes 600.
Three characters take 'em down, each gets 200. 6 characters take 'em down, the ExP get divided more ways, so each gets only 100; i.e. precisely half of what each member of the smaller party got. I don't see the point in going through the motions just so I can reduce the 100 a bit further.
Now, note the difference with 3e. Above, the base calculation was dead easy: add and divide. Doesn't matter what levels the individual party members are; even if you do the adjustment it's still going to apply equally to all. But in 3e you need to do a different base calculation for each different level represented in the party. And this was 3e, not 3.5; my 3e DM took this straight out of the book back in 2001 and spent years swearing at it.
Lan-"henches and hirelings are for these purposes ignored"-efan
if people get it in their head that every moment of the life of any character needs to be played out at the table. This harkens back to more traditional D&D campaigns where characters would take time to properly heal, would train to gain some new technique, and would travel for some months to cross a huge ocean. In the right hands, these become the truly epic campaigns that span time, and even whole lives. But in this type of campaign, players have to come to grips with the idea that they don't need to interupt every bit of GM/DM exposition for fear of missing a chance to snatch every bauble and we don't need characters to slay every single rat in every sewer from their hometown to the capitol and all points beyond. In this type of campaign, players need to be disabused of the paradigm that there can be meaningful experience gleaned from 24/7 slaying and the hoarding of coins, and persuaded to understand that a differently-paced campaign than the frenetic insomnafests that are only governed by the rules mechanics of resource replenishment can be as satisfying or even moreso.
