it's almost impossible to give (or receive) feedback like this
we can only know what exactly happens at this exact setting with this excact material.
As a bare minimum, you need to have video of knob tweaking and resulting audio with different material, and even this will only catch rather large differences.
Better you team up with some local studio - after checking that they have an engineer that is also able to verbalize on subjective auditory impression. This is not trivial to find.
/Jakob E.
That said, I prefer the low-end on proto-2. Although it's hard to tell with this much compression going on. Imo, compressor character most clearly comes out at 1-2dB GR, but that might just be me..