If its getting hot in the pipes while running it must be lean. Fuel would then associatively be the cause. What is your fuel sytem consituted from, pipe sizes, is the reg blocked up? What sort of fuel pump. I assume the injectors flashed away when tested? You said they were cleaned. Thats good.
One thing I can definitely report is that nobody has ever has success running an na 20v with a microtec. Theres some reason why they dont run good and its to do with how the microtech works, ive read about it but cannot recall the exact details. Google around and see what you can find out about how the microtec works. Where did your current map come from?