Then why not implement an aggressive team balance system?  After one team wins 5 consecutive rounds, do a scramble?  Arrange players evenly by KPD so that the top 5 players (by overall KPD, not by score on the team) of both teams have roughly average KPDs?  I'm sure a more complicated balance system could be thought out, but I was thinking of something using weighted averages to pick members of each team, i.e.

T={}
CT={}

players={1,2,3,4,5,6,7,8,9,10}

let's assume players 1-10 have KPDs of 10-1, respectively

random send the first player to a random team, for example CT

then T={}
        CT={1}

then #2 goes to T
        T={2}
        CT={1}

then find the average kpd of each team, weighted for # of players (T=9/2=4.5, CT=10/2=5)
since T has the lower KPD #3 goes to T
T={2,3}
CT={1}

now the balanced KPD is T=(9+8)/3=5.67, CT=(10/3)=3.33

so the next player goes to CT

CT={1,4}=>mean=4.25
T={2,3}=>mean=4.25

equal, so randomize again (assume CT)

and so on...eventually this gives you a team of (assuming randoms always go to CT)

CT={1,4,5,8,9} |KPD={10,7,6,3,2}=>mean=2.8
T={2,3,6,7,10} |KPD={9,8,5,4,1}=>mean=2.7

I am by no means a programmer or a mathematician but I feel it's easy to see how an aggressive balancing system like this could work (if it could even be implemented into CSS, I don't know jack about css except for some old sv_cheats 1 scripts).  Could also factor in server rank/# of kills to compensate for those (for example) that have never played before and are rocking a 20-1 score.