Ross,
The Nikasil is only a few thou thick. Is the scoring scratches in the plating, or deposited aluminum from the piston? It looks like that piston partially seized at some time. If its scored into the plating then yeah I'd replate it, especially if your going to keep it awhile. Send your "A" piston and have it finnished honed to "A" size. If those marks are aluminum stuck to the plating, they can be removed with muriatic acid, CAREFULLY. Then clean it up with a scotchbrite pad, and use a "B" or "C" Vertex piston.
Since you already have an "A" piston kit, a replate is the way to go as far as cost effectivness as long as you can wait for turnaround.
The Wiseco is forged and the Vertex is cast, so there will be some design differences.
The PV (all PVs for that matter) is a sloppy mechanism by design because it must operate in a dirty environment, however you may be missing a washer\spacer between the bearing and drum valve. This happened to someone else here once. Consult the parts manual. This is a nice PV design as its simple and uses all steel parts, easy to clean up. Also, just toss the bearings and replace as they are cheap.
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