This One has Me Stumped

I do not have experience with your models, but in general, and to refrain others:  

1:  Check the source out-put max voltage  specifications to the pre-amp input specifications to assure tolerances are stacked.  Adjust the output voltage accordingly if your phono pre or DAC permits such adjustments.  

2:  Check your preamp output max voltage specifications are stacked to your power amp input specifications.  Adjust if the preamp permits.  
 

3:  Tolerance stack output/input impedances source to pre and pre to power amp as well. 
 

I had an experience when I got my current integrated amp as a replacement to separates.  My DAC XLR max output voltage setting exceeded the XLR max input voltage specification for the new integrated.  This caused clipping distortion.  Once I stacked and adjusted the DAC max output to the integrated max input specification, the clipping distortion vanished.  

@glennewdick intros a 'phile phenom we've encountered.....

The Vulture...... "IF that's broke, can I have That?" *L*

(....ready to catch what's tossed in frustration.... ;) ...)

..just teasin'...

If Pass can't Rx the issue, @jsalerno277 seems to have an advanced routine that might cure.....👍🤞   Good variable factors.....

@asvjerry Thou speaketh like you have an engineering or science background (variable factors). I, a quality engineer, Six Sigma Blackbelt, VPQARA, medical devices, retired.  

@jsalerno277 ....*L* No, more a background of having engineers design an 'enhancement' that drove fabricators and installers nutz do to the 'special tool' that didn't seem to hit the site with 'Gadget X'.....;)..... just jestin'   *G*

"Practical Magic" is more my experiential background.... 

You need a tech to put it on a scope to check the bios which could be causing the problem.