Hi Is it the same side that is failing ? eg drivers side or passengers side ?
I have only broken the occasional CV / axil doping it a 6000 rpm( No launch control) with 400 whp 510nm and 255 tyres. So getting it spinning will help I guess! (3:9)
(But I guess at the sticky surface of the drags and 3:54 diff, it is tall order to get it to spin)

If it is the same side, check the LSD is working correctly