I agree with most of the others about trying different ammo, you may find some that shoots better than what you're shooting at present.
On my list is usually Federal Auto Match, it's bulk ammo but man does it shoot good in most of my .22's.
I own 1 K-22 and 2 M-17's and have no problems with the Federal. Some people wrap .22 brushes with brass wool and use a slow drill and plenty of bore cleaner until the chambers are polished up all pretty.
It may be worth a shot in your situation, just don't go crazy with the drill. Make sure the chambers are dry as a bone before shooting. The chambers are tight for a reason.
They are fine shooting, classically styled revolvers as you know and they need a little attention until you find the right ammo. I don't bother with the expensive target ammo but if you got the dough that may be the way to go.....