I'd go with the .250" which will lower your POI, everything else the same. Then you should be able to adjust your POI up with the rear sight, as long as it's not all the way up now.
I have a 627PC & a 327 TRR8 (5" bbls.) & they both have .227" gold bead front sights.
On the 327 I replaced the front sight with a Hi-Viz .250" red front sight. I don't have any notes showing it was a problem.
The rear sight is the original & it's not adjusted abnormally for the 158gr bullets I usually shot.
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