All I can say is when I ran 5 sessioins at Buttonwillow with 2 year old axle bearings, I had 0 knockback.
For once I took the economical route and it works. I do want to switch to a 7/8 master eventually and that could change things. Your real problem is Baer doesn't offer a decent floating caliper. You are forced into a floating rear end if you want 0 knockback. If you aren't in a hurry, give it some time for this new baer setup along with the Speedtech to get some miles under their belts. I also feel if you keep the rear wheel lip where it is currently, you will have less knockback naturally. A 5.25/5.5" BS on a 12" rim looks great but it puts a ton of leverage on a bearing. Matt over at Art Morrison calculated it for me and it is 5 or 10 times greater(Don't remember) than what the bearing was engineered for originally. FYI Have you ever seen a deep dish on a Corvette.
