I recently bought a Heli-Max Rotofly. Does anyone else own one?

I can't get it to hover successfully because it drifts to the left and backward, even with full right and forward cyclic. I even adjusted the servos to provide maximum right and forward cyclic.

I adjusted the servos by unscrewing and popping off the servo arms and moving them one or two clicks clockwise.

It would be nice to extend the servo rods as well but they can't be extended.

I also removed the training gear, because I thought it may be moving the CG too far to the rear.

However, it continues to drift to the left and back.

I have added some weight to the right front corner of the landing gear. Seems to be helping a bit with the left drift, but it still drifts back a lot. I'm planning on adding even more weight.

For weight, I'm wrapping heavy-guage solder around the right-front landing gear.

Has anyone had experience with this kind of an issue?

-scott