Only change your prop dimensions if you want to change your motor's performance, props can get you better hole shot, better top end or better fuel consumption. You can get improvements but typically you trade off A for better
B.
Aluminum props can loose pitch when spinning due to it being aluminum, stainless won't flex. This may not be an issue though if you are running low HP.
If it was me, I'd get a new prop and have your current one refurbed to carry as a spare.
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