It is going to be difficult to get any model this size to do even the basic sequence well. There are a few things that will help. If you had to be on your toes at all then you were running too much throw. IMAC flying does not requre much surface throw at all. Go with about 12 degrees on elev, 25 on rudder and aileron, use a fair amount of expo. Set it up so it feels soft, if you are used to running excessive throw to the point of instability this will feel uncomfortable but practice and get used to it. As for setup, I agree with everything BMatt sayes except I suggest you run one degree positive in the wing, zero stab, zero down thrust and 3 degrees right. The positive in the wing will allow you to run the CG a little more forward. I would suggest starting at 30%.


Now for the really hard part, Get rid of any and all excess weight. This means lighter hardware, in some cases if you san shrten a screw do it. Look to your wheels, axles, tailwheel assy, batteries, fuel tank, servos. Basically anything you can replace with something lighter. I needed a CG shift on my pattern airplane, my fix was to replace a dozen of steel screws in the tail with aluminum screws so be creative. Dropping a pound out of that airplane will be the biggest performance gain you can do.