ditto... as I listened, I couldn't hear anything that stuck out to me.  I think perhaps if I could hear the vox soloed as you can, then perhaps yes, BUT... when in the mix the vocals sounded fine.
 
The mix can cover a multitude of minor issues so ... while this is something that you heard and were concerned about, most listeners would never hear it if you didn't point it out..... so learn to correct this issue with singing technique now that you are aware of it.... and keep recording some rocking tunes.