Ive used 25 microns (shimstock) for a while now because if its too far out of occlusion I have to remill.. Some Drs want shimstock to hold, others use 200 micron!
Develop a dossier system for your client's settings.
I have two guys that I am right on the money by free forming the occlusion to a pin point and using cut intersections in exocad. After glaze the contacts are right on most of the time holding mylar ribbon in situ.
My others I do the same, but I don't use cut intersections and go by color of the pin point contact's intensity. This is for clients that aren't as exacting or have different staff members doing the temps. I have found that the less time the patient is in a temp the less adjustments are made. Most of my single monolithic crowns are returned in two or three days unless I am slammed, some same day if appointed. Makes a big difference.
Start with one client you trust and ask for their feedback on a specific patient's crown, then go back and look at the intensity map of the contacts in your software, keep notes and make adjustments until you get a range they are accepting. Takes some time and persistence, but pays off long term.
I have a competitor near me that is mostly analog. I respect his skills and over the years we have had a lot of the same picky clients sending work to both of us.
Since I have moved to digital I am getting all of the work from the client's that sent to both of us unless I am slammed. When I ask them why, the response is mostly the consistency of the seating times 10-15 min. They say that the patient's comment on how easy the seat appointment was compared to all of the other restorations they've had over the years. So I spend a lot of time with any new client and try to find the sweet spot for them using this system. If I can't find a range that works for them in a reasonable amount effort, then I let them drift to another lab. The process of weeding out the docs that aren't consistent in their techniques allows we to focus more on the ones that appreciate the effort.
$.02