grid and arc have different diffusers so the LED hue may be slightly different. previous edition had a corrective orange gel per ring which was a nightmare.
yes, the new knobs feel closer to a potentiometer. there are other greases available that I could look into if people are interested in loose encoders. to be honest this latest edition is what I was originally trying to accomplish, but I understand there are different desires.
tuning the arc can happen with a 1/16 hex. don’t overtighten to avoid binding.
also! wanted to reiterate that the new arc uses a fraction of the current and fully works with switch/etc!