I purchased a new cap (another .04 cap) and appears to hold pressure now and release steam when loosening cap (something that never happened previously) when engine is hot. There was no additional output via the overflow tube after spirited driving or letting it idle.
I will pressure test again to see if I am able to get it up to 14PSI or so, but cap seems to have been the ultimate culprit.
Sincerely appreciate all the comments and support on this forum.
Best
Dave
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