with all the problems you've had, I would suggest you make changes on a minimal scale, so you can treat problems logically, and as they crop up and not muddy the waters by wholesale changes.
Agree. It’s not about making minimal changes though, it’s about making one change at a time. If you change everything at once even if it fixes the problem you won’t know what the actual problem was.
Or worse, you change everything at once, don’t fix the original problem, and end up with another problem that you have to troubleshoot.
on this forum site, I've heard there are some FSM's for download. I've never accessed them, because I have many of my own, but they are invaluable for reference for members who don't have their own manuals.