I understand wanting a nice game and at today's NIB prices customers deserve a game with no playfield issues. However, for this issue I would recommend stopping the playfield tear down and play the crap out of your game to see if the clear coat issue gets worse. If the issue does get worse Stern may replace your playfield.
For now I would do a touch repair on the shooter lane, put mylar down in the shooter lane and a Cliffy protector as well.