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@snoops
There are better value options out there now than a Ceramic Speed OSPW. KCNC make oversize systems or you can find good value individual jockey wheels. If you’re buying them off eBay, make sure they are sealed bearings.
A DA 9100 derailleur will take a 14t at the bottom; I wouldn’t change the upper wheel unless you can find a replacement with the same depth tooth as the original, as it does make a difference to shifting.