Yea, I'm bummed I didn't know about the 40-CU unlock, although it probably wouldn't have had much impact on mining performance. It still would have been neat to test. I did build a whole automated solution for auto-tuning each individual board. It would start at the "best" settings and then downgrade every time there was a crash. If it wasn't crashing, then those were the new "best" settings for that individual chip.

afaik unlock was discovered very recently

It was discovered recently, however we were dealing with asrock and AMD directly given the quantity we bought, and they didn’t say anything. Kind of lame imho.