Bass leaves after amp warms up?

You may be dealing with the inherent shortcomings of the gear. Nothing is perfect. Hot running amps such as tubes or ss class A may satisfy you more. Or be brave and learn how to set your amp up yourself. I would second guess anyone's adjustments, factory or not. Even (respectfully), Ralph's. I can pretty well guarantee it will change just in transit, never mind during break in. And I wouldn't trust factory break in periods either, (respectfully). I have never received gear back from a tech or engineer or brand new for that matter that didn't need tweaking in regards to offset or bias, even in reference to factory spec. And the sonic differences can be dramatic.

You may be dealing with the inherent shortcomings of the gear

I took that into account that is why I've tried over the last 6 months
3 amps,2 pair speakers and a partridge in a pear tree

Okay, but the operative here is that 'nothing' is perfect. Ivor Tiefenbrun, the inventor of the famed Linn Sondek TT started his quest after buying a system way back when and taking it home only to discover it had no semblance to reality at all. Well, he took it back to the store complaining it was defective. They unapologetically informed him that no, this is exactly how it should sound. He then(thankfully) went on to correct some of the problems. You clearly need a partridge in a pear tree.

And why doesn't anyone even in search report similar issues?
I reject your theory

Okay. Not following your question. Atmasphere's first post is what I conceded to and my subsequent post is the position I hold. Simply my opinion FWIW.