Returned to VR tonight after taking a couple weeks off for traditional gaming (among other things). Was fully expecting to be horrible at Audioshield, but it appears the motor skills take longer to fade than that. After a couple of songs I was right back up to my previous performance levels, and even eclipsed some of my old scores. Pleasantly surprised by that really.
Also played around with the render target multiplier, and while it certainly makes a crisper image, 2.0 was full on reprojection hell in Audioshield, and 1.5 was a 50/50 mix at stock GPU speeds. Setting it to 1.2/1.3 seemed stable, but in the end I just dialed it back to 1.0. The extra fidelity wasn't worth the inevitable temptation I'd have to blame reprojection (real or imagined) for any miss. Might mess with it again in a game that doesn't require rapid precise movements.
On a related note, VR passed my personal litmus test for long term interest: leave something for a period of time untouched after the newness factor wears off and see if I have any interest in it later on. Generally speaking, if I'm ambivalent about returning to whatever I left, then I will likely end up ignoring it completely sooner or later. In the case of VR, not only did my desire to return to it gradually increase over time, but the return experience was just as engaging as it was before I left. I think I can safely say at this point that VR isn't going to be something I'll just get tired of and let gather dust.