how many cells?

[tallyram]

hey guys, i'm running 6s lipo right now and was wondering how much performance my g2r would loose by going 4s or 5s lipo? by going with less cells i would also like to add more capacity. i'm running a 1950/8 with a 12020. i'd like to make it a little more controllable on the track. also what is a good weight for a g2r? mine seems a little on the heavy side, 12-15lbs im guessing for mine. thanks in advance, carl.