How to determine the RPM for all in?

Hi gang, clearances measured good and new cam installed, broken in and running good when not under any load. I’m not able to take it for a test drive yet but want to see what you guys think about my timing for the application to get it close.
Specs:
5.9 Magnum
Stock heads
Hugh’s camshaft 1418aln10 214/[email protected] on 110 lobe separation
Air gap intake
727
3:55 sure grip
275/50/15’s....about 26” diameter
I have a fire core distributor with a one light and one medium spring.
Runs great with no load.
I have the initial at 20* and final mechanical at 32* but it’s in by 1900 rpm.
Seems way early. My next move is to go to the 2 medium springs.
Thoughts?