Phil,
With the throttle you need it so the engine stops with both the trim and the stick down. Ideally the engine should idle with the trim in about the middle position (to keep some adjustment available). Also, with the trim in the idle position, when you push the stick fully upwards the throttle barrel should just open fully. You will need to fiddle with the linkage to achieve this as you radio does not have travel adjustment.
My apologies I am telling you what you already know.
Not much else as the plane was pretty good when you brought it out. You might want to consider turning the Rx switch so ON is at the back, this is really a matter of preference but most people seem to go for back is on.
Only other thing I can think of is the nosewheel. Might be worth trying to file a small flat on the leg where the screw tightens (if there's not one there already). This can reduce the change of the wheel turning around on a bumpy landing (like Mike's deadsticks



)
Terry