Well i was running 3.5 yellow injectors as it would pink on the blue ones, but it was a bit of a misson to stop it overfueling. Wish i had brought megasquirt at the time, sold the setup it in the end. God knows where it is now though...
Still suprised you are getting it to run on the blues, any increased fuel pressure at all?
Looks sweet

, where abouts in the country are you ?