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Hogue sells cover grips that would slide over there and are indeed smaller and may tighten up your grip.

https://www.hogueinc.com/

They are about the same but contour can give a better fit as well. There are places that will do custom grips as well. Hogue's slip overs will not decrease size of the grip. I would check out S&W medium frame grips as they tend to run the same frame sizes.

Hogue sells cover grips that would slide over there and are indeed smaller and may tighten up your grip. Item# 75526 may fit, for $8 its worth the chance.

http://www.handmadegrips.com/