Whats the natural voice of your guitar: dark, balanced, bright? Balanced or tending to bright, you could check out the BD. That will do nice in a sevenstring. If you favour the Abraxas, that will do too, but I have no experience with sevenstrings, so can't predict how tight it will be.
If it is dark I would install something brighter, like the VHII, which has some familiarity with the HD, though not compressed and very punchy. I have this pickup in an ash strat and it feels quite hot, nearly as hot as my Crawler.