It looks like the front is running out of travel and offloading the rears. I probably have 20 - 30 videos of mine doing the same. If you can, lower the front to get as much travel as possible - set the front shock rebound (extension) to full loose and start making passes. Tighten the rebound 10% each pass until the 60 foot times start to fall off.

I tried to sort out the rear first and didn't make any progress until I added travel and started tightening the front. I now have 5" of travel in the front with standard valved Dual Adjustable AFCO's and already ran out of rebound adjustment, but went from 1.48 60's to 1.41's. They are currently getting revalved with stiffer valving.

Also make sure your rear shocks are long enough by unbolting the shocks and letting the rear hang. The shocks should be an inch or two longer than the distance between the upper and bottom mounts when suspended.