So I went back on my word. I just finished the 16 minute test before I do the Pan-X. Just to call it a wrap.
Tri-X Reversal. D19 1+0 , 16 minutes 1st / 8 minutes 2nd.
Here's the news. Nothing to be gained between 12 and 16 minutes. 100 ASA is still the best result but probably not as good as 12. More contrast and tones crunched.
But then there was only little improvement/difference to the 100ASA exposure between 8 mins and 12 mins so I was kind of expecting it.
200ASA more usable but the bottom 3 zones are more or less combined flat black.
I'll post the scans next week.