Agree EXO is not really up to rear tyre duties in the likes of the Lakes, whatever the pressure. I’ve had better results with tough/fast casing WTB trail boss, but more recently Spesh slaughter grid. Both good tyres, slaughter a wee bit quicker as it’s lighter and has a quicker centre tread, but still grips really well when you lean over into side knobs.
One wee suggestion is technique over drainage ditches, lots of folk thunder into them, doesn’t really matter which tyre you have if this is the case. However, lots of big rocky lakes-type descents have constant rocks which are effectively square edges, and once carrying a bit of speed, it’s a lot more difficult to weight/unweight.
I like TJ’s suggestion of a padlock, one through the front rotor would do, as long as it’s still in sight and only for a quick shop visit.