John > my opinons on decreasing your time investment once on route.
Full tear down and resleeve all coils and rebuild all mechs.
LEDs everywhere for reduced heat and need for replacement. I use primarily comet warm white frosted as they are cost effective and wrok great with nice color. LEDs are attractive to non-pinheads it seems.
I use the clear rubbers and they hold up much better than white or black.
DBV is not needed if .50 per game and easy access to change. It is a good idea to install and I liek the mars upstakers. I would look at all you other pins and I bet you have something that works on a different game somewhere?
We do .50 for nonDMD, .75 or 3/$2 for clean DMD, and $1 or 3/$2 for new DMD.
I have had good luck with PBL coin mechs. I have found most older mechs will work well if I run them through the ultra a few times and clean them up well. You can open them up all the way if you are concerned about slugs or bents and want them to get jammed less.
Depends on games and your player base but typically start at medium difficulty and then adjust. 1 min ball time, 3 min games should be a general range. Easier and people tend to lose interest. Harder and no fun for anyone.