I know Lurvi, he is a very skilled and expert BS of course, one of the best.
Anyway a lot of this misunderstanding about his DPS is due to a Louhi parser which was posted long time ago, where Lurvi was topping the DPS with 2K+.
There is only one reason why at that time he was doing so much damage: he was comboskipping with perfect execution, and he was incredibly good at it.
Otherwise BS has never been able and is not able to score 2K+ DPS on any fight in game (while hitting 1 single target ofc), at least since I play this game (half 2011, maybe in previous versions it was different).
In PvE BS can score 1500-1600+ on some fights, but in the same fights a good sin, carnie conq or necro equally geared / skilled scores 2000+.
So your assumption about BS topping parsers is wrong.
The only fight in game where BS can top parse even in good raid group is, sometimes and with some luck, Hator Ka, cause of the mechanic of dots which remain after boss teleport and since IB dots are probably highest dot in game.
BS can be in the top 5 in some fights though so yes: BS DPS is perfectly fine as it is.
There is no need to buff DPS and there is no need for Mutilation to get a lot of kills (sometimes Iron Hide build works better than Muti, it depends on the mini; it means nothing, mini setup was favorable etc, but this a screen taken 2 days ago with IH build:
http://imageshack.com/scaled/large/14/9x5y.jpg ).