Hey jb, i can vow for the VL2 in full-volume metal show. I used it on tour with my doom metal band in amsterdam and belgium, and i use it regularly with the cover band in any genre. We often do "themed" shows where i sing, pantera, type o negative, korn, and so on. It never failed me yet.
The only real problem is with the harmonies. In a metal show, both drummers hit hard, have big crash cymbals/chinas, big guitar rigs, and often small stages, rendering the harmonies useless. I use it only when i know it will work, or tweaked to -10 or 12 dB just to give that "extra thing". (i drive my band mates crazy, begging them to sing along! lolo)
If your having problems cutting, it might be the gate. Do not use AUTO setting! In a loud gig, the mic will get so much noise, that it will start gating the mic like hell (tried it once at rehearsal).
But you can describe what settings your using, and the tech guys in the forum, will likely help you sort it out.