(most likely) another calibration question...

[Foxmxrcer]

currently...
TII 87 shelby z
3" exhaust
3" swingvalve
intake
MP stage 2 LM
valve job/back cuts
180* t stat
and some other small stuff

now, I was looking at FWD perforamnces site for a calibration for more boost, because I dont realy want to mess with the rising rate fuel regulator, and i dont want a (in my opinion) sloppy 5th injector. For the stage 4 and 5, 4 says 16psi, and for stage 5, it says 18... but they both say spark and fuel curves for up to 29psi? so whats that supposed to mean? or are they the same? I want to run about 18-20psi for now, which should be plenty to keep me happy for a while. what else do i need besides....

stage 4/5 LM
3 bar map sensor
+40 injectors
walbro 255 fuel pump
and an adjustable fuel pressure reg.

also, is it worth it to do this? or would it be better to spend my money on other go-fast parts?(recomendations welcome)