Sorry about that, sometimes it can be sort of difficult to convey the concepts via text only.
I've always felt that with the hybrid hammer pianos and no bump-mod, where the hammer curve is more rounded, that the key gets heavier towards the bottom of the keystroke. So, a player may need to apply an increasing amount of force to reach the end of the key stroke, rather than a constant. This would mean when applying weights, perhaps the key might be floating in the middle and you'd have to keep adding weight until you finally bottomed the key out? Not sure if that would be difficult to measure or check.
As you mentioned with the factory bump mod pianos with all-plastic hammers, and that sharper hammer curve, I'd believe that after the initial attack it would be much more of a constant weight. Probably much easier to measure. However, is the weight a player feels based off of that initial felt-dragging on the attack? I can't say for sure and might not matter as much.