Thanks rharv!

I did that and just bounced around the tracks trying to get them all adjusted to approximately the same perceived level of loudness. Then I rendered each track and have listened a few times and still have some adjustments to make.

I didn't know if I might be screwing things up by starting with already individually mastered tracks. And I have a couple of tracks where the vocals are not forward enough in the mix. They seemed ok as a one off but next to other songs they sound a little off. I guess I have to go back a bit further on those.

Thanks again for the advice!