If your looking to run a 4efte MAP sensor then they seem to work best with the 4efte 295cc injectors too.
To get it running properly I'd just stick to everything stock to start with ie MAP sensor, injectors, regulator etc. Fang around like that off boost to make sure its all working as it should. As a suggestion (you may already be - havent checked all the photos) , why dont you run the stock regulator off the fuel rail then tee the aftermarket reg into the return. That way it only steps in when you come on boost but all the cruise/idle stuff runs spot on as factory.
Yeah the old diag mode on 4age ecu trick works, locks the timing and you can then even run a pot off the water temp sensor to fool the ecu into dumping more fuel for boost. Trick is to stop the stock ecu seeing boost else the who shebang will go up the hootanany and then you'll be scraping willy willys of your whoopsadoopsys...
Holy crap I wanna see this thing doing skids