Kafin, one question you asked was about the engine quiting and the plane getting loose on the lines. You may know this already but when that happens to me i always back up as quickly as I can until you get your line tension back and can land safely. The Banshee is very capable of flying all the stunts in the pattern. You may want to build a simpler plane to practice stunts. Something that you dont care if it crashes. It very cool to meet a stunt flier from Indonesia too!
Kind regards,
Kevin.