Michael, I suspect something went wrong. I develop TMY2 the same way you did: XTOL (stock) at 6:30 @ 68F, but agitating less than you, and I get normal density and a normal CI of 0.57. What's the density of your leader? Mine is 2.76, which is higher than most films.
Originally Posted by Michael R 1974
YIKES! I just remembered another detail: I always pre-soak the film! I discovered a year ago that TMY2 gives higher densities when pre-soaked. I give it 4 minutes agitating twice per minute. Sorry, I should have mentioned this earlier. But even so, the lack of a pre-soak should not cause an N-3 pull.
Anyway, your test is probably useful because I've noticed that under/overdevelopment does not change the shapes of curves much. Could you post your numbers or graph? BTW, thanks for doing these tests!