Update: Was called and told machine was fixed last week, I've been asked to test prior to delivery... so next Monday I am going to the Dealer (1hr away) to test. Apparently it was a bad flow control valve and the dealer also raised the pressure in my system (I'll get more details on what exactly that means to share back here).
If it is in-fact corrected, would likely help be a fix for a lot of other folks 299D3's... I'd venture to guess there must have been a batch of bad flow control valves put into the machines during assembly. I can't imagine I was "lucky" enough to have the same issue on my purchase and also a loaner
... if so I'm going to purchase some lottery tickets.
@Rueben-Fraizer Thanks for starting this thread hope my findings might help you down the road too. Will let you know how I make out next week.
Thanks again folks... the support, knowledge and advice of you've shared here is H-U-G-E and kept me level-headed through this very time consuming journey.