Interesting.
My experience is that Mathews pull 2-3.5 lb over on the 70lb mods for every model since and including the Triax.
I have a Vertix that I ordered new with 75lb and 80% when they came out in 2018. It arrived with 75lb and 85%. It pulled 79.6lb out of the box with the 85% mods in. I put 70lb 80% mods in it (which pulls 73.2lb) while I waited for the originals to arrive and have not bothered switching them since.
My Traverse (70lb 75%) pulls 72.8lb and V3 (70lb 80%) pulls 73lb. I had two Triax’s back in their day that pulled 73.2lb & 73lb each also. Before that I was shooting an X-Force for over a decade and only had 1 buddy with a Mathews (No Cam).
This has also been evident on my brother’s Triax, V3 and phase 4 and well over a dozen other Mathews that I’ve set up for buddies. What they ended up being set at varied depending on the shooter and their set up, but they were all pretty consistent out of the box.
I ended up buying a second bow scale etc so I have a workshop at both houses to save me flying gear back and forth many times a year and I got the expected variations between the new and old scale, but not several lb differences.
Only my experience, but I guess both my Last Chance scales could be reading out?