Been busy so THE most expensive 1/8 brushed crawler does not have even a hint of grease in the rear axle, and oddly just one rear shock had a preload spacer not the other !
Had the rear axle out and rather than heavy grease i have oiled the internals, better than dry, i have moved the esc/rear shock towers forward to lay the rear shocks down a little (free mod)
stripped rear shocks, lubed with green slime grease and fitted a pair of 1mm Orings under each piston all back together and this has had the desired lowering by a couple of mm and fitted high clearance stainless links to rear, still got front to do.
I also took tyres of and fitted 60cm of thin solder to each wheel hub, then taped it down, can only help