I got about the same power, but I don't race. Well one day I did, back in 2004. I made 4 passes on an old airport runway, no prep. Car went 93 in the Eighth.
My axles are Resplined C-body axles, in a narrowed rear; I don't have your kind of problems.
I gotta get me a pair of those tires!
What else are you running back there?
I've twisted the splines on 8 3/4 reworked truck axles (cut and splined at Mosier) I thought it was the spool. 10” Hoosiers. I would think someone offers a quality axle. Running an 833 with sintered copper clutch behind my 365 ci La.