Rear-end is kicking up on truggy, fix?

[Finnster]

So I have been running my Hyper and CRT.5 quite a bit on a local track for practice. I have been noticing quite a bit of kickup of the rear end on my CRT.5 after a hard landing, or an uneven landing where the rear wheels land 1st. Basically the truck then bounces up in the rear and usually loses control. If I land flat its fine.

I'm not quite sure what adjustments to make. The shock oils seem pretty well matched to the shocks, but might I need heavier oil in the rear? If I were to change springs, what direction to go, softer or heavier? (I can make a case in my head for either o_0 )