OK, I have finally had enough of my chain coming off on the rough stuff, I have tried shortening it, changing the cage length to a medium (and shortening the chain some more).
As I rarely use the big ring on my patriot I have come to the conclusion that some form of chain device for a two chain ring set up needs to be tried.

So…..What is available for bottom bracket that is none ISCG and that works with a granny and middle ring set up? Or how do I stop the chain coming off so often.

Oh and my knees just wont survive going to a single chain ring.

Blackspire stinger or e13 DRS would both work i think.

My chain always used to bounce off onto the bottom bracket when on the rough stuff. I fitted a XCG triple made by MRP and its not come off since! and it protects the outer ring from rocks.