My remarks assume full photographer control over both
lighting and the numerous antics of the camera, like auto ISO, not to mention PP effects like Lightroom ACR's Auto Tone. Now, about that spurious red:
I’ve been shooting a collection of 19C silver subjects like a coffee pot. I am deviating from histogram orthodoxy in that my camera's histogram is pushed signirficantly rightward, intentionally; yet, these raw shots are never touching the right edges of the D810's JPEG histograms.
This higher exposure makes silver shinier, which is what my customer wants
. The shots are high-key, with no blown highlights and with no shadow-recovery issues -- I guess I am doing ETTR, but surely for my own reasons, as amfoto1 has suggested above can be legit.
Yesterday, I noticed some unwanted red on my new 34" curved IPS monitor. I found I could easily take down the red with the Lightroom's Saturation slider for red. An alternative is to lower the Exposure slider (or shoot accordingly). I am also able to (barely) discern some blue and green. I eventually experimented and found with my pro strobes (I.e., not speed lights so I'm talking about shooting in manual mode...), that a cure for my red was to change the power setting to less power on one strobe!
Consider your lighting. If your red is blown out to the point of losing detail, then crank down one light bit-by-bit until you cure the problem according to Lr Develop module's rendering of the image and histogram -- or try adjusting any other lights, as needed. You could perhaps introduce a diffuser close to the subject and distant from a light source, as well, to prevent blown highlights.
I am finding that minor adjustments in lighting sources' (1) intensities, (2) tilts, and (3) twists are useful to test. The inclination and elevation of your subject wrt your camera may influence what works in your subject, as concerns highlights and shadows. For example, a slight rearward tilt of a coffee pot rid me of an obnoxious reflection -- presumably by changing the angle of incidence of the reflection. The effects of this give-and-take may be easier to see with silver (specular) subjects, but how light works does not depend on the subjects.
I could mention, wrt your own exposure concerns, that Lightroom tripped me up this week until I noticed it wants to do Auto Tone for me, which is not done very well at all for my silver subjects. So, I’ve been undoing Auto Tone until I figure out how to permanently prevent it in the Library module and in the Develop module.
All of !! the above is based less on any expertise than on my learning-by-doing during the last few days with silvery stuff, a demanding subject matter, especially as mine is not tented. Lacking abundant expertise, I'm not certain that I am on the beam, however, and not sure what you are shooting, either, but maybe this can help out.
I have an issue with ETTR, exposure to the right. On paper, it makes sense to me, slightly overexpose so you don't get a lot of noise in shadow or dark areas of the photograph. However, I have found, at least with me, it usually overexposes particular colors, especially reds. Even when my histogram shows that I haven't gone off the scale to the right, my reds are overexposed, and I lose some detail. What am I doing wrong? I am interested in hearing what other fellow hoggers feel about ETTR.