A. I'm generrally a fan of stainless (however, my Carvin Icon 5 tends to want other stuff)
B. youtube videos of the VP exhibit a mid heavy tone, which tells me that stainless is a good route, to open up the sound a bit more
C. I have Lollar thunderbird pickups in a Japanese Fender Jaguar bass which acoustically is very warm and very very loud. It has always worn stainless and DR stainless Low Riders are the second best tone I've had on the Thundercat (discontinued Dean Markley Helix Stainless were the best tone), and overall the best balance of feel and string to string balance.
D. soooooooooooo The VP is gonna start life trying out stainless. I have a set of Low Riders on the way and a set of GHS Super Steels.I have said before, I think that Low Riders are overall, the best stainless on the market right now. One of the best tones, good feel (although I don't even mind the feel of rotos). And while they aren't technically a balanced tension set: they feel more balanced than some others. Even others from DR.
I have only ever personally used Super Steels on a shortscale Dano 63 bass I had. It definitely lacked the warmer and more interesting mid character I am used to with Low Riders. However, it had a real nice and grindy growl. and the feel of the strings was quite slick?! Also, nowadays, most of GHS strings are now sold standard as balanced tension sets. So I thought I would try them on the VP. Especially with the limited saddle adjustment, a more balanced E string in particular, could be a real good thing on a VP. And the VP's pickups may be so mid heavy, that the super steel tone should balance out fine.