After an embarrassing number of times using the setup I realized the left older unit is ending up with much higher mAh results. I swapped cells and same results.
This leads me to think I need to keep the same cells tested on the same tester to keep a standard.
Wish I knew this then I would have ordered more than 2 more chargers.
After testing a few cells to confirm, hopefully, that the new chargers are at least consistently wrong you might be able to work out a fixed offset or percentage to apply to any capacity reading by the new ones?
The next time I had it on Grad. mode before connecting cells and it test all of them.
Capacity looks right, the right number being low due to coming out of the box like this: