I swapped my 2015 Croix De Fer over to a 1×10 setup last week but I’m struggling slightly with 10th gear. All the others are fine but in bottom the chain is catching on the next cog and jumps when you go over any bumpy ground, is there anything I can do to sort it?
I’m running SRAM S900 GXP cranks with a SRAM direct mount ring and considered swapping the BB spacer from the non driveside over but then the chain will be bent out even more at the top of the cassette??

Sounds more like the high limit screw on the mech needs a tweek, then maybe a touch less b-tension if the low gear can take it.

Will give that a try cheers, been a bike trials rider for the last 13yrs so I’m having to relearn gear adjustment and setup!