I think you have achieved a lot! Just keep at it in your own pace. Dont stress it.
You have had a loads of good advice allready so i wont go to much into it.
I too have issues playing live for others, more or less freeze up. But its a lot easier to do it here in the forum in an AVOYP… theres nothing but nice, helpfull and cheerful people here, that can point you in the right direction. It is beneficial for you to try it out…
For the F barre… well. I have trained a lot on it… and it is still a challenge. What i did find out at some point though. And you can almost call it a cheat by putting on a capo it becomes a lot easier to play all kind of barre chords. So by pure luck for me i need to use capo on a lot of songs when i want to sing them. Try it out. Even if you dont need the higher pitch it is a good exercise. Be careful to be too used to use the capo. It can be hard to go back to play these chords without the capo
Hi John, welcome to the community. Sounds like you’ve made a lot of progress.
@Snah already suggested it - switch the strings out for 11s or 10s to help with that F barre. 12s and called lights… but really they’re not! I changed my strings to 11s when learning F and it made a huge difference.
Welcome John Really interesting to read your background and where you’re at. Lots of others have given you some great advice so I’ll just leave it at “Hi” at the moment, looking forward to hearing more from you.
Actually, one piece of advice… It took me about 3-4 months on the F barre chord, the lightbulb moment was moving my barre finger much higher than I’d thought, I play it with the first finger joint up at the low E string. We’re all different but it’s definitely worth experimenting with different positions in all directions. No doubt you’ll get there.
Welcome to the community! Some advice for making acoustic a little easier:
Tune down all strings a half step. Try “silk and steel” strings, these are supposedly low tension strings.
Hello John and welcome to the community.
You have enough good advice already.
I will leave it at saying that I admire your self analysis and think such an approach to assessing your strengths and weaknesses will serve you well as you progress.
Thanks so much to all who have replied with your words of encouragement and helpful tips! I’m already seeing some progress - I’m playing clean F barre chords on the 5th fret fairly consistently, and working my way down the neck. I still take too long to form the chord shape, but trust that will improve with time.
Once again - thanks to everyone for your interest and help!
Hi John, welcome. About the barre chords I can say it is two things, position and strength. Developing the strength is a matter of practice, but without the right position more strength won’t make it easier. Last week that I was revisiting one of my barre chords I tried doing the barre only and checking the sound of each string with different positions of the index finger and when I had it right for me I added the rest of the fingers. I did that way because the strings that sounded muted doing the chord were the fretted ones.
by putting on a capo it becomes a lot easier to play all kind of barre chords. So by pure luck for me i need to use capo on a lot of songs when i want to sing them. Try it out. Even if you dont need the higher pitch it is a good exercise. Be careful to be too used to use the capo. It can be hard to go back to play these chords without the capo 
Really interesting to read your background and where you’re at. Lots of others have given you some great advice so I’ll just leave it at “Hi” at the moment, looking forward to hearing more from you.
It took me about 3-4 months on the F barre chord, the lightbulb moment was moving my barre finger much higher than I’d thought, I play it with the first finger joint up at the low E string. We’re all different but it’s definitely worth experimenting with different positions in all directions. No doubt you’ll get there.