Nice runs man, working it down.
If you preload hard at the line you shouldnt break any axles off the two step. Just need to preload the drivetrain almost to the point where it starts to skid the back tires on the ebrake. Do it right and you will get a very nice spring off the line.
It took me 7 tries messing with the 2 step rpm starting at 5600 to 6400 and embarassing myself from redlighting and lurching foward and bogging getting used to the twin disk but once i got down just how much i could let out the clutch before it just fully grabbed and the correct rpm it came off the line hard and im on stock b13 outer CV's as well. No issues at all.
Just takes some practice but its very benificial.