Finally got back to this. Well, the major problem turned out to be my incompetence. Somehow, I omitted the seal under one of the CV pistons when I reassembled the right hand carb. There was my vacuum leak! I'm still using the pilot jets from the rebuild kits but did put the original slow jets back in. When I compared them to the new ones, there was a noticeable difference in the size of the holes drilled into the sides of the tube. The new ones were smaller.
I'm moving on to a rebuild of the front end and a new front tire. After I finish that, I'll be able to ride it and get serious about carb tuning.
Thanks for everyone's help, it's appreciated!