Maybe the Nailbomb is not the best bet for your demands. A lot of people stated is sounds thinner then the HD, which has massive (low)mids. I understand Tim's advice very well. The Crawler represents for a great part what you describe: Not overly tight, not piercing, but not dark, cutting (but again, not piercing), throaty, bold, organic. It's definitely not superagressive, but growling in a fantastic way, providing great leads, a topend like I always wanted (just enough treble), bold midrange, cleans up great. This pu can be shaped very well with the amp-eq. It can be biting with a lot of treble, but not piercing. This pu has vintagehot-character though (which I like), where the NB is modern voiced en not (so) warm like the Crawler. You have to decide what is important for you, modern agressiveness like the NB, or organic, balanced, throaty, big vintage-oriëntated tones with enough output to drive an amp (Crawler).