I've had problems with the slipper shaft too. I spoke to someone at the distributors SMD who was hugely unhelpful and very patronising to boot.
The 'join' between the slipper assembly and rear gearbox is the problem. It's a rigid join that has no way to flex or move and is, in my humble opinion, a poor design.
Can I ask: where exactly do you put the washers to stop losing the diff oil? I've put heavy oil in mine too and it does leak out.
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