There was some good useful feedback from the previous posters as well as consensus on the vocal talent. Great example of what a forum can do for you. I was inspired by the positive vibe to give the song a listen and had a slightly different take that may help round out the previous suggestions.
1. There are no rules. Conventional song structures "work" for a reason, but I find my favorite songs (including Beatles) -don't- follow a convention. That being said, you were looking for some ideas, always a great thing to do.
2. My interpretation of your request was to find a way to create more "contrast" between the "verse" and "chorus". Typically this might be desirable if you are looking to make the song more "interesting" by providing a greater range of "emotional dynamics". (Don't mean to get too academic here, but we're stuck using words.) The "dynamics" can be achieved in the ways previously mentioned (such as make the verse more "versie") Another couple of arrangement options to think about are;
- change up the instrumentation for verse or chorus to enhance the "contrast". I.e. perhaps some arpeggio guitar lines in a higher register to "lighten" it a bit. Might help to change the rhythm guitar sound, or mix in a cleaner tone track.
- some shift in the percussion (repeating a good point made before on the high hat)
- consider widening the sonic stage with b/u vox panned wide left and right + delay, etc
3. Glad to hear you're finding that performance is trumping gear. Truly the essence of any good song, and a welcome relief from all the gear happy discussions elsewhere. I finally learned that -any- piece of gear is just a tool with a certain sound, and if it works, it works. Marketing can often get in the way of how something actually sounds. Does not matter how much it cost.
It might be interesting to try another song with the same approach. You may be on to something.
4. And then again, you're goal may be to maintain that driving grinding type of groove throughout, in which case you might want to think about working on some variations in the drum grooves.
5. And yes, highlight the vocals. That's the "hook", if you care.
keep at it.