If you want your vocal sound thicker try... singing thicker. It's a matter of technique, not plugins or digital editing. You guys re being really lazy, relying on software plugins and stuff like harmonizers. Look at this picture:
Seventeen vocals tracks. The guy who record that shit is no less than Freddie Mercury for the song Bohemian Rhapsody. No digital duplication, no octaver, pure analog stuff. So, next time you're tempted to be lazy and duplicate your track, think about this wonderful song and how Queen achieved that sound with HARD work.
Now, to your song... let's see...
Problem is you're experimenting some kind of delay so your vocals sound weird. If you want to reinforce your lead pan your bG vocals like 11 and 1 o clock' with a pinch of reverb. I noticed you abused the digital verb too. The goal is to make it sound natural, not overprocessed. Try running a de-esser on your track to remove the sibilance. And don't overuse it.
Good luck.