I noticed that AndreiLux was in your credits for contributing to this kernel. Do you know what he does with his Perseus kernel that allows him to use 64GB exFAT cards? Or is that a secret he holds for his kernel to compete with yours? Just wondering!
The only issue I have w/64GB exFAT on Andrei's Perseus (all versions so far) is when the swap is happening, I have to be looking at the Storage screen (under settings) and watch it swap for it to do it properly. I know that sounds crazy, but it's 100% true and others have verified it multiple times. If you let your phone reboot without going straight to the Storage screen, it will put the 64GB for both internal and external so when you look at your "My Files", everything is duplicated between sdcard0 and extSDCard. Deleting a file from one WILL delete it from the other!