I dig it, the only advice I have is that I think it should be more up front than it is. I've only been able to listen to it on my car speakers though. I'll have a nice set of headphones later tonight. I wouldn't worry too much about the vocals. I'll likely record another track of vocals over top the existing ones at the very end. They're being drowned out in a few places already, prior to the bass. I dig it though, so much so that I wish I could hear it better.
I've given it a few headphone's listens and its great. I really dig the playing, you're a hell of a bass player. I don't think you need to rerecord it. I just thought it was too quiet before, but now upon further listening I think it's just right. Great work, I really dig the touches in the quieter sections. Also, I think the tone's cool. I'm going to post this as the version to work off of. It's bad ass.