OK well listen this is what im gonna go.

Run my 1930/7 with 17/72 gearing and 18120 controller with 12 gp3300 in series with a y adapter in series and a separate 5 volt 5 cell 1100 nimh pack for my servos.

Should i run the slipper really tight or loose?

If that works, i just hop in the 16 GP 3300's no problems?