And one more thing, if "unfair reps" are the problem, banning the person from repping for 30 days is an idea. If he/she repeats it, make it permanent (Like trolling on a new user for making a thread in 2-3 forums could get you a months ban from the repping system)
If you're still having issues with the repping system, increase the min limits after which people can rep. Quite a few forums only allow their senior members to give reps.
/ 
(Like trolling on a new user for making a thread in 2-3 forums could get you a months ban from the repping system)
