You're right - you've found a winner! I'm amazed by what GP has done with this one, especially for the price. I take this plane to the field every time now.

Mine is powered with an OS 50SX and 11-7 APC. Enough power for anything!
Control throws for the Elevator will do... but I pretty much leave mine on hi-rate all the time with a slight (10%) amount of negative Expo (Futaba). I bet you'll want to kick up the aileron throw as I did mine. I don't have the measurements but I did increase them a bit.
I did add 0.5 oz of lead on the tail (underside of stab).
The plane does do very nice spins and snaps (pretty avalanches).
Haven't weighed mine but it seems to be as light or lighter than my Flip 3D with the same engine.
Best of luck,
Scott