I think the vocal mic you're using on those songs sounds like there's some funky pixie dust going on in the upper regions, and it's causing your voice to sound unnatural and way too sibilant ... and it's somewhat weak in the mids (EDIT: I just noticed from your post that you're using a C-1. That would explain a lot).
I'd really like to hear your voice on something really mellow, ala Jeff Tweaty. Would like to hear some actual midrange in there and hear what your voice might sound like without the 12K fairy dust on Meth.
I'm thinking SM7. As for condensers, I might try an Audio Technica 4047 or a Shure KSM44. Either of those would give your voice just a hint of high end juice, but without sounding unnatural ... keeping the midrange intact.
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