I think you missed out what I was saying.
Rev 2's is when the change to a more efficiently designed driver was made. Slight different to rev 1's. Which I own.
Rev 2's originally had angled wooden connectors like the later batch rev 1's did.
Rev 2.2 covers all LCD2 rev 2's released after early wooden connectors. These had slight different pads and metal angled connectors. Rev 2.2 was a thing made up here on head-fi to distinguish between old wooden connector rev 2's to new metal connector rev 2's.
No such thing as rev 2.3's. But the last few FR graphs from recent owners from late last year to current have a more balanced looking LCD2 - judging from FR only compared to old wooden and very late 2012 to early 2013 metal connector rev 2's.