One last update.
I swapped the 12A ESC for a 6A unit with the brake setting activated, and added more down thrust. I also made up a 260mah 2S pack. Net weight reduction was about 9g or 10%. The rudder throw has also been reduced by about 20%.
Flying performance is now even better, especially the glide. Full power is invigorating but controllable - this morning I even managed a passable(?) immelman, a split S, a loop & a barrel roll

. Being such a small machine, you have to really concentrate on the attitude of the model at all times, or you get disoriented real quick!!
A simple trick I use on these small models to accurately get the CofG right, is to insert a pin into each wingtip at the required CofG location with the pin head protruding about 3mm. Then I can quickly & easily lift the model by the pins to check that I have the model balanced correctly - far more accurate than using your finger tips! If you decide to move the CofG, just relocate the pins accordingly.

- pins inserted into the wingtips at the CG location