So the Optimizer is off, but playing with the DRA slider still impacts the picture? Even though it is a subset of the Optimizer? Are we sure that playing with it just doesn't turn the Optimizer back on? Just seems strange that turning the Optimizer off would still allow its settings to do something.The Dynamic Range Adjustment slider works when playing HDR content, whether the Optimizer is On or Off.
The current conventional wisdom (unproven, just theoretical at this time as far as I am aware) is that leaving the Optimizer Off provides an 'unadulterated' signal to allow JVC's DTM to do what it does best. That is the current thinking anyway.
The Dynamic Range Adjustment is still a variable in HDR output from the 420/820/9000, and in fact was the subject of a recent post I made on this subject. There is a default position, which to some degree is arbitrary, and which may or may not be suitable for a given projector/screen/room. But it seems that this variable has not yet received much attention, in terms of determining whether or not making a change to the default setting would benefit or harm JVC's DTM functionality.
As I state there, the setting for this Adjustment is impacting DTM, as it is part of the Panny's HDR output processing. The question remains as to whether the default setting is, or isn't optimal for JVC's DTM, or whether it could be useful in customizing to one's individual room, projector, screen, etc.
I have everything zero'd and the Optimizer off on the 820. Perhaps I need to switch back to the Sony and see if the 820 is hindering DTM.