I’ve done endless faffing with the E13 XCX and the Superstar guide above, never got them to how I liked.
Fitted a BB-Mount MRP Lopes the other day, perfect first time, zero issues, no spacing or flddling or anything. 73mm BB, SLX Cranks, MRP 34t ring, job done. If the MRP 1x is the same setup (a assume it is) I’d go for that ahead of the E13
Unless you move a 2.5mm spacer from the NDS though you introduce other problems, if you move a spacer across your cranks are offset (I did it for a while, and couldn’t tell, but it’s probably not a great idea).
Can you not take some material off the back of the cage so you can push it further inboard? Looks to be plenty on there.