My set up is 1×10 with a 40t hope cassette expander, 32 NW chainring and a MRP AMG device
Clutch mech cage has a little play (front to back) 8mm before it becomes firm/stiff.
If I manually move the chain to the chainstay there is very little resistance.
Obviously in a higher gear when descending so more chain slack.
Maybe 2×10 was not so bad after all.

Anyone got a thought on this?

Your clutch needs adjusting/tightening

Too much chain?

Is there any difference between the resistance when the clutch is turned off to when it is turned on.

Would say you need to remove a couple of links from your chain. Show us a pic of your mech when on the t-rex.

Chain & mech is too long. I have a 1×10 set up with a short cage mech and its not a clutch. But I get no chain slap at all.

Its not rocket science, just remove the excess.

Removed air from shock to get full squish and I don’t think I can remove anymore links.
I’ve tightened the clutch and it’s is a fair bit stiffer so fingers crossed that’s it sorted now might even take the MRP off.

That looks good to me.

Yep don’t think your going to get any shorter there..well not much anyway.

Same issue for me – chain is as tight as it will go, but there’s slop in the clutch mechanism – I had a look inside and it’s play in the mount for the roller bearing. Gives just enough slack for the chain to rattle around a lot, but not enough for it to fall off (so far!).

(XT shadow+ mech running 2×9 with an XO 9s shifter & spacer)