Condensing Spell List in Battle

I'm aware of 1.1 not giving the best results but I have been using 1.1 for my hack for so many years without issues...I would have to start from scratch and that would be a lot of work. Is there a safe way to downgrade to 1.0?

Also...if the bug is confirmed (or is that a feature?), I don't see 1.1 as being a problem, same if it's not compatible with patches that FF3usME provides. Can any of you confirm that it actually work without issues when applied to 1.0? I feel like I'm the only one actually testing the patch.

Edit: Just tested with a clean FF3 1.0 ROM and it freezes exactly the same way with the same random behavior. Like I said, this is somewhat hard to reproduce because it can go without problems and suddenly decide to crash after 20min. Gonna have to disable this patch until problem is fixed.