There could be any number of things at play here.

First... avoid using the TC Helicon V2 on the vocals and guitars. You want to have the voice essentially un-effected by anything other than some reverb and EQ. 99% of the time, if you add FX to try to make something better, or hide a bad performance, it's a clear indication that the underlying track is poorly recorded and the FX are an attempt to get an easy fix. Inevitably, the end result is worse than the original. It's always better to let the warts show and work on solving the foundational issues.

Second... what kind of backing are you using? I know it's BB but are you using a midi style or is it a style that uses real tracks? Midi tracks will sound stiff and un-natural, even with the best singers.

Third... how are you mixing the vox into the BB tracks? The vocal track needs to sit in a certain place in the mix and really needs to sound like it's a part of, and not apart from, the mix. Too loud, or too soft and there are problems.

Fourth... the reverb you use should have the effect of making everything come together in a cohesive unit. It should sound like it was all recorded in the same room, at the same time, by the same musicians. Every now and then I hear a song in the Showcase that sounds like the singer was in a different room from the band.

Getting this all balanced will take time and experimentation. Perhaps take the time to post a song here if it's something you're not ready to "Showcase" quite yet. There's no problem posting a song here when you're looking for MIXING AND PERFORMANCE feedback. That's what this forum is for.

It's easier to give accurate feedback when we can hear what you're talking about. That way, we can give specifics for you to try and work on. And... you can ask specific questions and point to parts of the song as needed so that you can get the information you need to make the mix sound better.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.