Curious as to why you want to remove the VCT, when the motec has the adility to control it? You could always fit an rb20 inlet cam, as it is designed for hydraulics and has the 4 bolt holes at the front.
Twin rb20 or 25 AFM.s should do the job with only the larger piping causing issues. Should be able to get them on here for around $50 each. IMO twin z32's are overkill, as they will max out at over 500rwkw, and have poorer tuning resolution compared to 20/25 units.
Its really something you need to setup on the dyno, i doubt there are too many back to back rb26 to rb26/30's running the exact same setup to do a fair comparison.
Another dyno isnt going to help, Could there be an issue with valve float? I would just drop the exhaust at the cat, and give it a run. Are you running a screamer?
Matt sends you the base maps when you register, then you can load them into the chip. Not sure weather there was anything on the chip, as i just loaded a bin. file to my liking.
Is there any particilar reason you picked those two turbos? I would go a 3076 .82. Plenty of response and enough flow to blow a stock motor if need be. Can make a drivable 300rwkw which is enough to have it spinning at any legal speed
Just finished a rb26 nistune ecu on an rb25/30 neo using a custom AFM. Paired up the afm inputs and o2 inputs inside the ecu. AFM will max out around 380rwkw. Had the car running good base tune in about 45 mins driving.