I have a YS120NC in mine turning an apc17x6. I added two washers under each left engine mount to firewall, and I can see that I probably should add one more. Mine does have a small tendency to pull over on canopy when hovering it, but I'm debating if it's enough to add down thrust. I just flew it today with the battery mounted in the rear, and it still didn't act tail heavy. I then added 3 oz of lead to the tail, and I diidn't feel much of a difference. Tonight I removed the lead, and added some 8 oz of weight (two large bolts) in the rear with my battery. I'll check tomorrow to see how that affects it. I am really not afraid of making this plane quite tail heavy, maybe ending up with CG 2-2.5" behind recommended. It is my experince that these long tail moment planes don't become ultra sensitive on elevator like a short tail moment plane does.
I don't have any mix other than flapperon and spoileron on a 3-way switch. Mine tugs a little to the gear in kniife edge, but no more than is easily compensated with input from me. Once I have the CG where I want it I'll look into mixing that out.
DKjens