Mustang mine are the same and it flies fine, its not optimal but with electronic radios expo can be set to suit.

AUW on mine ended up at 6.87kg so it suprised me... my 50cc sbach came in at 7.2kg...

Ive added some setup pics, moved the rudder servo forward so i could run less weight up front and by chance it also allowed a nice alloy horn to be fitted (wont fit in std servo position).

It runs dual 4000mah 2s batteries up the front ( total 8000mah) and a Tech Aero IBEC for the ignition (run this same setup without issue for ages in other aircraft) the batteries are setup via a miracle dual switch..

Servos are High voltage 1218TH power HD's all running on their own channels via a DX18 and voltage and temp feedback via telemetry (rpm next few weeks)