Just wanted to give feedback!

The oil pump seemed the ticket here. Put in a new Melling (old one was a new Melling too..) and oil pressure is much lower, but stays stable at 4.8 bar (round 70psi).

Oil seemed slightly used, but no metal traces at all, also after letting it sit overnight. Oil filter the same, very clean. Much cleaner than I expected for a brand new rebuilt motor.

Oil temp seems much lower now. But need to get another probe tomorrow. Will report!
Did not disassemble the old oil pump yet... no time, just lot to do...

Just for info. Drag torque at WOT and 1500rpm is about 8Nm with warm oil and coolant... cast pistons with stock replacement type rings, 344 with 9.8 compression.

Thanks to all for the info. This was very helpful!