Dude were you at big valley this last weekend? Good stuff there,
anyway, this might sound kinda wierd but what if it's the posi in the diff slipping intermittently???? Kinda like a grab, let loose, grab, let loose vibration that's shaking the ******* outta your ride?
Like you said though, I've done lots of research into those rear ends and yes your overpowering it, thats' why it's chewing through axles and could be the source of your wheel hop.
Just my Opinion, I'll have to do some research for this one.