Hello Bill, I see your question has been waiting, with no takers.
As you probably realize from your own engineering experience, and from 10 years of trying to debug that system. There is no 10 or 15 minute answer.
My offer in these cases is here.
Let me know if you have contacted them on this particular issue and range of options yet or not.
Regarding myself, I am a 75 year old semi retired mech engr. (HVAC, domestic and Aerospace applications). I am willing to spend as much time with you on this as needed to get the entire situation sorted out in the most optimal fashion.
However I work entirely at my own expense, pay my own broad band and phone bills etc.. so that it is too much of a risk from me to get deeply involved with something that is clearly limitlessly more than 'just an answer', without some sort an understanding regarding rating my preliminary advice if you find it useful, and agreeing to what ever premium services I offer that would be included in a project that could take you and I days, including a lot of tests and research, to resolve.
Such costs typically add up to 20% or less of what on site service costs would be to resolve all of the problems.
Let me know how you would like to proceed,