Nitro test and Vacuum pump down on Mini-splits.

Been installing a lot of max length minisplits this summer, I’m installing CEs as well. I’m wondering if anyone’s is having issues with balancing taking a minute on nitro.
I know nitro moves a decent amount but my field piece digital gauges are usually showing at least a pound to a pound and a half of psi loss after 15 minutes.
Vac always gets to sub 100, but after only two/three
hours on the pump decay approaches like 400/450.

Acs never have an issue with vaccum, pressure might drop .2, cleaned out my gauges as well.

I’m was chalking it up to nitro moving. But I got a call back on one and now I’m worried I’m being a hack. I take pride in my work, but if I’m being honest I’m one of the guys who was never properly trained or educated, just followed the steps I’ve seen for years.