Bob, it seems we've been in the same boat. My low end, well everyone's to some extent, doesn't carry as well as the high end. Thanks to the teaching that I received as a member of a barbershop chorus and some quartet coaching too, I've been learning how to get the low end to ring more like the high end does. I'm still practising to make it more consistent, but when I'm warmed up and if I'm singing a song I learned after I started to understand how to do this, I can get it fairly right fairly often.