Couple of battery questions?

Hi Guys,

Got the 8T sorted now and have the iCharger 208B and the Hyperion 6500mah 35C 4S pack.

The 8T is pretty uncontrollably fast on 4S, does anyone here use maybe 3S with Truggy to make it a little more driveable for racing, etc.?

I've put the MMM ESC punch control to 70% but still it's pawing at the sky!!

Should I keep with 4S and up the punch control to 80%+ or maybe use 3S perhaps? Let me know your thoughts guys?

Also, my charger can do normal, fast and balance charge for lipo, do you guys ALWAYS balance charge your lipo's only? Is it unsafe/unwise to use fast/normal charge function?

Or is it that you can use fast charge but maybe only a few times before then doing a full balance charge?