Best thing to do, if you have one, use a digital vernier and measure the jurnel (sp) to see if its still in tollerance. this will also let you know what size bearings you got, standard size, etc.

if you are within tollerance, then like you said, wet and dry them smooth, thats what i did, look spot on now. and you cant take to much off with wet and dry as its all harderned.

As for heavy duty bearings, Burtons your place for them