Some DIs are known to limp at 16psi hauling. Yeah I use to run 22psi (CRD) stock ECU without limp up until I started to haul up hill. I can run 30psi if I choose (CRD) remap.

Do yourself a favour and try reducing max boost _ back off Dawes boost controller in 1/4 - 1/2 turn increments and see how goes..