D6 for me is all about where I place it in the hole.
Too much into the shell and to the beater and it becomes too much click only, really stiffy, which I don't really dig.
Maybe it didn't work out with the kicks I tried it on so far though
e602 is certainly more a fit for metal than the 112 or 52, but the 91 seems to be perfect for those kind of sounds, especially with a D6.
That one mic in the kick drum shootout posted around here seemed to be pretty awesome too...miktek something? not sure anymore
edit: ah, well, video posted 2 posts above this
yeah, was the miktek that seemed to "nail" pretty nicely, altho maybe a bit too much for some stuff. the mxl was my fav back then I think.
and from that clip I think I always had the d6 too close to the beater so far, and backed off a bit much for the last few tries...