Dntm, with the 100, little heavier then your 110, I have the batteries in the tray behind the hatch, ignition batt. is directly behind the wing tube, rudder servos are pull-pull. The cg with my setup is 3&7/8ths & it could go further back for 3D but I like it where it is. I think you are going to need your flight batts to be up fwd of the wing tube with that engine but thats just a guess. Mine is balanced near perfect for IMAC but then I don't have any coupling to speak of either. I haven't spent a day with no wind mixing it out yet because it's so smooth the one good day for it I just burned gas getting comfortable with it. Every other time I have been out with the bunny we have had wind & thats not a good time to sort out mixes.