I put my Trinity d4 1s 17.5 on a motor analyzer & the sensor readings were way off. Big spread on all 3 regardless of what timing is set. I played with the shims trying to get them equal but it didn't work.

Here's the result of of the last test I did at 30° timing:
A = 19, B = 18, C = 19, Average 18°.
RPM 18630
KV = 2300
AMP = 1.1
U = 8.1

This was with 2 shims. The addition of an extra shim brought the average up to 19° but lowered the other numbers.

I have a second motor of the same kind and am trying to match them as closely as possible.

Any thoughts or tips?

Thanks in advance!

Your numbers indicate a 1 degree spread, which is excellent. There's nothing more you need to do. The last Trinity I measured had an 8 degree spread-- and that was a new, certified motor.

I thought the average meant it should match the number on the endbell. That's where I was confused. But thank you for clearing that up.

That's why in my opinion, the "Certified" thing is just a ploy to get big money. You find stuff just as good if not better on the hobby shop shelf.