I thought of something else. The previous generation of Trek MTBs had journal bushings (Delrin) rather than bearings in the rear suspension pivot points. I have a really hard time with that extremely low-rung, high friction pivot on a modern $3k+ bike. Check to see if that is the case on this generation of Top Fuel bikes.
It sounds ridiculous, but the more-free suspension the better the bike rides in every way and it’s more than noticeable.