I know this may be a controversial topic but I want to get everyone's advice on the best exegetical commentaries on Galatians and Paul's use of the OT in this letter?
Have you tried looking at Bestcommentariers.com to see what they classify as "Best"?
https://www.bestcommentaries.com/galatians/
Have a look at:
https://www.logos.com/product/5321/commentary-on-the-new-testament-use-of-the-old-testament
Some places to look:
https://www.challies.com/best-commentaries-on-each-book-of-the-bible/
https://www.ligonier.org/learn/articles/top-5-commentaries
https://library.tiu.edu/c.php?g=305319&p=2036228#s-lg-box-6509255
I have tagged and priortized based on the information I found in these links.
-john
