Heliguy Forum - RC heli forum

I have the "Lama 5" 4-ch heli bought from *****. Whilst it's a good little heli for learning with I'm finding it a pain in the neck as it needs a good 50% right rudder to keep it from yawing left during flight. The rudder trim is already hard over but I can't dial the yaw out.
The 4in1 Rx/gyro module that comes with it only has a trim pot for (what I presume to be) gyro sensitivity, not proportional.
The gyro works fine in bringing the rotation rate back down after a turn so I don't think it's at fault but what I do see is on initial spin-up the rotors don't start at the same time, hence the constant yaw.
Does anyone have any suggestion on how I can correct this ? Would installing an ESky Lama 4in1, that has the proportional adjustment on it, help ?

Thanks in advance.

PS I had thought of just buying a Belt-CP, but the other half says I have to learn to fly this one first