I've got mine balanced on the 'fattest' part of the wing, where it humps up. i personally don't use dual rate or expo but my flying buddy doesn't have as steady a fingers as I've got so i have the duel rates set to 100% deflection but he has it on 60% expo.

for hand launch i hold it between the fins in my left hand, holding the TX in my right with my fingers pinching the ele/ail stick (i don't fly dumb thumb) with the right wing tip about 6" lower then the left i shove it WOT with my mouth and as soon as it stages on the pipe i let it loose, no toss required. the wings torque level as soon as it leaves my hand.

i don't think you'll have your hands overly full with the engine you mention, i use a Jett FIRE 60LX on mine and 160 mph is all it'll do, the people claiming 200+ are only fooling themselves. don't sweat the deflections much, just give yourself enough you know it'll fly (3/8" up/down), they fly great at very slow speeds and aren't nearly as agressive as they are at WOT so keep in mind you don't have to fly with an on/off throttle

hth
kc

EDIT: forgot to mention my elevons have been shortened to help with the hand hold during hand launch.