I'm pretty sure Mr. Bickel knows way more than I ever will when it comes to setting your car up. Anti-squat close to 100% hits the tires harder than lower AS numbers. That is a good thing.So you think a lower IC would be better? I've talked to Jerry Bickle and he was the one that got it where its at. It use to stick the tire then spin, this was as good as I could get it in current set up. They do make a newer version Hoosier 33x15x15 that works pretty well with no shake. I'm pretty local to Hoosier and they had given me some test tires when developing the new one its a much stiffer sidewall than there old version.
Reducing front tire weight all the way through the launch is tougher to do.
If you had that video so you could play it frame by frame in front of him, he could probably give you 3-4 things to adjust to improve how your hot rod launches.
This^^.You need to stiffen the rebound on the shocks in the rear (assuming you have double adjustables) if the tires look like they are "chattering" which can lead to spinning. I'm assuming it will do this even at or before 60' sometimes?
I tuned up my little 4 link program so Extension (Rebound) damping is 4 times more than compression damping. It made a big positive change from .1 second to .3 seconds and reduced front tire weight.
Adding front travel also helps a bunch. It took more "fiddling" to finally get some weight on the wheelie bars so it could be possible to hang the front end depending on how much adjustment is in the bar mounting holes.
In general, to lighten the front, which maximizes rear tire force, one needs to move the IC forward and up but like above, I will defer to experts in the field.
Just for shiggles, measure the distance from the ground to the center of the cam, or as best as you can estimate. A CG height estimate is a fundamental dimension that one should know for all this stuff.