I believe I've isolated the leak...
Cheap ball valves that I sourced from Harbor Freight.
My conclusion is based off the fact that as I'm pulling vac the needle rapidly moves up and pegs right around 23 hg, the needle is solid as the vacuum is still on.
When I shut the valve and turn off the vac then try to hold the vac, the needle slllooowlllyyy drops.. Trying different ball valves tomorrow and will report back.
I must say, I loved this project, really self-satisfying experience and a humbling experience as well.
G' nite Colorado.