Do you have any kind of data logger? Something that can tell you what your duty cycle is? Something you might also want to look into since you have a turbo on a high compression non turbo motor would be a wideband.

Yes afpr stands for adjustable fuel pressure regulator.

Good option for you right now would probably be some DSM 1g turbo fuel injectors. You can usually pick them up cheap too. Around $50-$80 for the set. They are 450cc injectors. With the safc you shouldn't have to worry too much about running larger injectors, you can just pull the fuel out with them. That shouldn't be a problem till you get up into something that is in the 720cc+ range.