Hi yankphan,
I Maidened mine yesterday, lost throttle on right engine, failed servo so engine went to idle, did a complete circuit and came in under power on left engine. not much rudder imput was required...
I'm using 14 x 9 Master Air screws with about 3/4 " clearence... Way over powered with the RCGF 20cc engines spinning the 14 x 9;s at 9400...
I ballanced mine at the 4 1/2'' mark which felt great... It fly's really well...