Atmospheric pressure here is around 80-85% of sea level. Given that your IDCs were ~70% at sea level, fuel is definately not going to be your problem.
I don't have the compressor map for the VF 30, but 1.25 bar at this altitude may be pushing a pressure ratio that is outside that turbo's peak efficiency. That turbo is working a good deal harder to push 1.25 bar up here that is is pushing 1.15 bar at sea level.
Check out :
If you dig around the forum, I think you'll find the compressor map for the VF30.
Good luck with the problem. You may have to get a re-map for your mods & higher altitude.