Ok. As I said before, I have not had any problems with the prior setup - thought I would changeup the prior piping to a different route. The ONLY thing I changed was to add a 9 inch reducer to the starting elbow and a 9 inch T. Everything else is the same as the original setup. The original set up had a 10 inch T off of the starting elbow with a 9inch reducer for the Damper and a 9 inch reducer funneling down to a 6 inch inlet to my chimney. This worked for many years - NO issues.
I had a friend who does HVAC come over to see if he could help and immediately he pointed out that my T that I purchased was incorrect, it was made for a HVAC system and not a furnace setup. I looked at my former 10 inch T and he was exactly correct. Instead of being a true straight T my 9 is a curved T to aid in the flow of Hot Air not exhaust gasses. My Bad for not seeing the difference immediately.
I reconnected the former 10 back up and it works like a charm! Just as it did before.
Thanks for your assistance these past 2 days.
I do have another question but I will start a new post for that.
Thanks again for your help.