OK, this really could be the tank liner issue. I hope not, because it almost impossible to clean up, but let me explain.
the time I dealt with this was just a few months ago, and the tank sealant job was done by a very professional COG member, an engineer, a very thorough person. He also let it dry for more than the prescribed time, but the problem came from pools of sealant in the very lowest points on the sides of the tank. Those pools are deep, and not cured.
Todays gas is loaded with cleaning agents. I know, because Shell V power ate JBWeld epoxy i put in my intake ports back on 06, which was unscathed by gas back then. It'll eat the epoxy, and it gets in the carbs and gums everything up with a thin seal over the jets.
Also, let me say I posted up the first post because the help you were getting, though good, didn't have the benefit of the knowledge I had of the situation. I posted because you were going to go down the rabbit hole and not accomplish anything, and I just wanted to stop the bleeding before it gets bad.
Send the carbs back to me. Send them this winter. Soon, while I'm not slammed - not in the springtime! Let me see if they're the issue, if epoxy is the culprit, and you can at least get a plan together to get your bike running for next year. HTH, Steve