Baby keeps waking up swaddle transition

I’m trying to transition my baby (9 weeks) out of a traditional swaddle (muslin cloth). We did one arm out for 3 days and that worked fine. Now I’m doing 2 arms out and he keeps waking himself up within 5 minutes. It’s not the moro reflex but rather he tends to stretch his arms above his head, arch his back and then ends up scratching his face with his hands and waking up. Should I just persevere or is there anything I can do to help him get used to having his arms out?