Most of the E conversions I've seen have been on MGT 8.0's and the slipper setup is a bit different. I don't know anything about how those slippers hold up.
Ive seen slipperentials, Center diffs, center diffs with Tekno Elektri-clutch's, a lot with stock 4.6 peg style slipper setups.
I was thinking about trying the Kershaw Designs Heavy Duty Slipper Spring setup to see if it would help. Ive emailed Dan and he said he thinks it MIGHT help and its worth a shot, but i don't have such high hopes