[paw]

Everyone knows you get more hlstats points winning than losing, even if the winning team has massively more points than the losing team. Even if you only get 3 points per kill and lose 25 points per death, you achieve game objectives and die less which result in higher hlstats score.

HLStats calculates the average skill per team (you can see it on the front page of stats.sourceop.com). Right now:
Red: 9294
Blu: 15534

Divide the lesser average by the greater average. Result will be between 0 and 1. In this case it is 59.8%. On average, team Red has 59.8% as much hlstats "skill" as team Blu.

This is our modifier. Blu team now will receive 59.8% HLstats points.

Tada, all the sudden all the good players won't join the same team, AND high skill players will have motivation to switch to losing team to turn the tides.