Note on the VP with Cobalt flats vs tone...
I had been running my Boss GEB-7 with a lop-sided mild inverse smile (more treble cut) on my plain IV with CFs. For the VP with RS66s, I ran a different inverse smile with even more highs cut, and there was still lots of angry piano kerrrang! But with Cobalt flats on the VP, I have to run things basically flat. Any rise in the mids at all leads to honk somewhere in the range of the first few frets.
That said, it didn't take long to sort that out, and she definitely brings the thunder, but I can still get all the mids and highs I want, when I want them. (I don't typically want a lot, but every once in a while it gets funky.)