WTF is "FAT formatter"?Some FAT formatters will automatically choose FAT16 if the volume is under a certain size. I've never had any problems with it.
There is more to an EFI partition than just "200 MB FAT32". Read up here: https://apple.stackexchange.com/questions/57597/how-to-fix-broken-efi-partition/58892#58892
BTW OCLP might not pick FAT16.