i experimented with heavier strings (.10 - .52 with a .64 or .66 for my lowest string) for a short period, and while i liked the way they felt, after awhile those heavier lower strings just ended up sounding more like a distorted bass to me
. i prefer the sound i get with a .10 - .56 or .59 set. all my sevens are tuned ADGCFAD.
it's really just trial and error in finding exactly what gauges work best for YOU, i think some of you guys get a little too carried away with this optimal string tension thing. just because the string gauges you're using aren't an optimal, precise, even tension set doesn't mean it's wrong. if it feels and sounds good to you, go with it!