Hi!'
A properly trimmed out "warbird" flies as easily as a trainer and doesn't have to be "flown " as you say, all the time.
From my Point of w you ought to fly some faster, low winged planes first, like Q-500 racer, and also build something so you get the hang of how a plane is constructed. From what you say it sounds as you have only flown ARF planes and not built anything...
It's also vital that you get the sense and feeling of how to set up and engine properly, especially so if you want to learn how to fly a twin engined plane.
Competition is the best learning ground! I have been competing in pylonracing for 30 years or more, Started out flying R/C when I was 21.
And I can definitly say that pylonracing is the best way (and most fun) to learn all the things you need to know flying fast,heavy warbirds ...and to set up engines.
So get a .40 Engine (TT or Kyosho .40 GX) and a Great Planes "Viper". Set it up with either Uni-flow tank or a Tettra "Bubbleless tank", 10x6 Graupner "Sonic " or RAM prop and have a ball. If you want more speed get a JETT .40 Engine.
If you can handle these type of planes you can fly anything!