well epoxy under the back of the inserts will never hurt. I do it to any pf sys 11 or older!!! I dont think they are moving, its just that you have 2 different materials with way different mass and they are expanding and contracting at different speeds and amounts, with a shinny surface
I dont mean to bogart this thread. I just wanted folks to know what to expect.
as for your question on what to do, it is so depending on your direction and expectations. some people who do clearcoats will knock out the job in 2 weeks. I used to do it in 6, and that is way too fast in my opinion.
If you get it cleared, you want to wait 3 months, and what I do is sand off the existing clear asap to hurry the process. I am accepting jobs. In the winter I dont clear wen it is below 25 out because I cant keep my shop above 75 for 48 hours, so I can never say how long it will take. Obviously I try to do them as soon as I have the oppertunity because I want to get paid and I dont get paid till the job is ready to ship.
BUT, here is the big part. on the pf's with the worst examples (and if you search the old pinside material you will see the pics I posted of a FT gold with massive insert and wood grain issues after 4 months) I sanded off the clear, i waited a long time (over 4 months) and I cleared slowly. 2-3 weeks between sets of 2 coats. * coats total, and after the last coat I wait 3-4 weeks, sand the whole thing level 800 to 3000 grit wet block sand by hand. So it is still going to have a little of that effect down the line, but MUCH less. plus it will last much longer. In a production enviroment it is impossible for them to do what I do (and good for me because repro's are 80-90% of my work)
so that is my opinion. other customers of mine may want to chime in