coolant pressurising after new gasket etc???

[Jimbo]

So as most know done my ph3 xud swap,
Built the engine up with new Victor reinz head gasket and head.bolts
All torqued to spec properly.
Now ive got heat in car, and it never seems to run hot like most of my other DTs have.
Just seem to get quite a hard top hose after a longish run

I didnt have the head skimmed as donor car was fine, I cleaned up both surfaces well.

Im gonna try a new stat tomoro but im not hopeful tbh. Just dont want it to.be headgasket failure after 500 miles.
Anyone had a problem before??

Car is running a gt1752 turbo 22 psi ish, on a govd bosch

Cheers, any ideas appreciated