Lmk what mobile client you land on, I've been meaning to branch out myself. You're far from the only one to have that crashing issue. Was a long thread of people with the exact same complaint just last week. I can find it if you want.
I've been out the loop for a bit due to irl shit so not even sure what Spring is. I know Amber is a signer so you don't need to put your nsec into apps, right?
I'm gonna test drive Primal for a bit.