Hi there guys.
as a clan leader who has been running hl statsx for some 6 months now I have managed to gather alot of info on this situation. And I have to say that we set ours to the 50 % to begin with but after only a few months it became clear that some players were running away with the points to the point that now we have several players on 90,000 points and still climbing.

. So about 2 months ago we set the loss up to 75
s have TSGK this has slowed those players down a bit infact i have started to drop my points

. but we are still thinking of adding in some other form of point cap as there are still some players climbing even now.
Here is a link to the way we have set out point modifiers
http://tsf.hlstatsx.com/?mode=weapons&game=hl2mp
and we are thinking of doing some more alterations to make it a bit harder.
What we have found is that players complain if a realy low skilled player kills them and they loose lots of points. I think the trick would be to keep the players under say 40000 points , and thats for the top player. This should mean that all player points are closser together thus the point gains and losses should be not so great.
PS. hope this helps but we are still monitoring our system and will be making some big chainges we hope in the next few months.