I would agree that there is a bit too much of the low end (just listened in the studio) but the bass guitar is not heard clearly. I wouldn't turn down the guitars before I found the frequencies that are harsh. They may not even be so much an issue once the cymbal is controlled.
Each and every piece affects the rest of the mix. Not just volume of any particular instrument. Vocals will not be in the 'right place' until the backing music is right. I'm not sure how one could even say that the vocals are at the right place, when there are other issues.
Sorry, I may be a bit grouchy. Need that coffee! Ran out...