I am amazed that the stock turbo can boost to 27psi.

Standard is around 9psi?

My Di-D boosts to 19psi but has a lower compression ratio - only 17:1.

I doubt the longevity of the 4d56 running at 20+psi, and stick to my guns that I would not advise it.

Do you have an EGT guage fitted on the exhaust, close to the head? What temps do you run?

PS That's my opinion, and it is worth what you paid for it.

Don't ascribe to malice anything that can be adequately explained as stupidity!
Pajero LWB Gen1 3.2 Di-D TD Engine
33" Bridgestone D694s
2" Lift
Front Runner Rack