I received a four gallon case of 777 panthemic developer last week ans was able to do a little film testing with Delta 100. So far I find a IE of 80 with development time of 7'30"
with 15 sec initial agitation then 3 inversions per 30 sec @ 24 C. The results were outstanding - extreme acuity, superfine grain. smooth tonality, excellent highlight and shadow detail.
By the way, what were the specifics of your development of TMY ?