Well, my first test won't be of any use. I hadn't used TMY2 with XTOL before, and hadn't used XTOL at stock strength before so I went with Kodak's recommended time of 6:30 @ 68F (which seemed very short) and Kodak's agitation recommendation. Way underdeveloped. I got the equivalent of N-3. I suppose I should have expected this since my TMX times with XTOL 1+1 are significantly longer than Kodak's.
The shape of the curve did resemble Mark's upsweep, but with this degree of underdevelopment I can't come to meaningful conclusions regarding TMY2's normal curve shape in XTOL so I will have to redo this at least one more time.
By the way my rolls are from the same batch as Mark posted.