After I added the system pressure gauge on my instrument panel, I saw that pressure would go really high when RPM was up. It rose in a linear pattern, clearly a flow restriction. I did some testing to find out where the problem was; disconnecting the lines and running the oil into a bucket.
Unfortunately, I can't find my notes at the moment with the actual numbers; but the results were clear. most or the restriction was the original SAME auxiliary valve block behind the seat, and the 3-point lift was restrictive as well. With my new pump and increased volume, it was really robbing power. At full engine speed, back pressure was almost 50 bar 700psi!
the flow is too tight for even the 14cc EU pump, and the US pump is 19cc. As stated above, I've put a 22,5cc pump on my tractor.
So I went to my workshop and made the fittings, bolted my bender to the bench and bent the tubes, then brazed it up.