Hi Bob,
I think some of what you are saying is right but I think you are approaching it with the wrong mindset. I can relate to being in a market where no one else is operating their business properly. Many shops in my area do not, hell I think most of them still hand write tickets and don't have a shop management system and I'm in NYC!
2 important metrics as you already know is Car Count and ARO. If you have a high car count, your ARO doesn't have to be super high to make gross dollars. The problem with that model is you have to ensure you are keeping your car count high and your shop work flow on point to move all those cars. It can cause more undue stress. The other model is a low car count and higher ARO. You are generally less stressed however your inspection, estimating and sales process has to be PRO and you have to have a high value driven model. You will only be attracting the top clientele in your area which will reduce your car count but give you the opportunity to work with better clients.
Maybe look into a 20 group instead of a coaching program. The costs are generally less and its more peer learning with a facilitator.