Sounds great so far. Thanks for the update.
One more thing, For some MX29L3211, I have to read, erase then blank check before I can actually write. I got 10pcs here and only 1 would erase, blank check and be empty before I can write. The other 9, I have to read them first. Otherwise, they would fail the blank check.
Edit: Added the 47uf capacitor and the issue is now fixed! I have now added 47uf capacitors on all my boards.