Quoted from chuckwurt:
Yep do this. Feel those inserts too. If it feels like they could chip eventually put Mylar over those too. Wax the playfield before applying and they will come up no problem later if need be.
Do this ^
I had a similar PF that Stern replaced due to the ghosting on Tobin turning into a crisp "edge" that could be felt with your fingernail. They agreed to replace the entire PF (and eventually did) but while waiting I mylared all the ghosted spots including Tobin and played hundreds of games. It never got any worse.