Puzzling! I'm running Losi yellow spring rear, associated 25wt oil, inner wishbone, middle tower, 4 hole pistons. 22 - 23mm ride height all round. Its fine at Tiverton (bumpy grass / astro).
The only other thing I can think of is to check the rebound on the shocks, take the spring off and compress. The shock shaft should creep out slowly. If it shoots out and hard to fully compress to much oil, you will need to bleed a bit out.
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