Well, I figured that I will put the 498T/490R set in another Les Paul, and I do not need two guitars that sound the same/similar. I also really like the sound of the Riff Raff, hard to compare clips but I liked it slightly better than the Black Dog for the metal stuff (a bit tighter), and it does the lower gain stuff better as well. Cannot quite remember which forum, but I found this guy Nolly, who recorded all of the clips on the BKP site. He was personally going for the Riff Raff, and he played them all! He sounds like he knows his high gain tone judging from his playing.
Really doubt that boosting will be necessary, my EVH 5150 is a beast and when I get my Kemper on monday I am pretty sure it will have more than enough gain as well

EDIT: I listened to some more clips, not quite sure how but I ended up on the Painkiller-site, but the tightness in the modern metal clip is just... Mmmm, eargasm! There is just something about the surgical tightness of a ceramic that really applies to me... Also listened to the C-bomb, and it sounded just as tight, very awesome! Actually did not find the CS quite as tight, even though it is ceramic too. I used to have a C-bomb in an Ibanez RG2020x, it was tuned to D standard so I used it exclusively for metal. How does it hold up for lower gain stuff? The Miracle Man is also nice and tight, but I do not imagine it being very versatile. I could be wrong though(?) If I am going this route I would like a lower output neck pickup, maybe an Emerald or Mule. God, so many options.. And back to start

Also, if I am going that route, I am gonna have to ditch the 498T/490R set eventually and get a lower output set for the other Les Paul...