I had the same problem with my regular sheeps foot. The screws are a freekin joke!
I eventually just swapped out the hardware for regular xm18 hardware and it worked great. So much more robust! The whole reason they had to go to a different hardware set for the sheepsfoot model is because of poor planning.
The top most standoff interferes with the blades edge when closing by
(I kid you not) 0.60mm! Thats a matter of sharpening it a few times!
What you could do is file just 0.60mm off the middle of the regular style standoff and face it inwards towards the blade edge during assembly.
As far as the replacement screws go, Im pretty sure they are Eklipse screws.
XM-18 hardware on a sheepsfoot below..