You are being helpful!!!
I also think it is air in the line(s) but I've never had to deal with this for as long as it has taken. I just wanted to have a sanity check.
The MC and booster came together. The calipers are GM with 11" rotors.
I'll try bleeding some more to see if there is a stubborn bubble stuck in there somewhere. Then go to spend more bucks on a bigger bore.
Again, thanx for the help.