HeliH, with FX2 this is what I read. 1:1 stock to water. Stock is 50ml of A & 50ml B plus water to 1 liter. Agitate 60 seconds, leave alone for 45 to 90 minutes for slow to medium speed films at 68deg. Use a water bath if necessary to maintain temp. TFX2 is suppose to work better with the tabular and faster films. Fog is noted to increase when using FX2 with faster films.
In past stand developing regimes I usually pick a temp that suites me such that it is easy to maintain and not too far off from the darkroom temp. such as 70, 72 or 74-5 and base my times on that. As I shoot LF as well, I was able to pull a neg at whatever time I wanted. Maybe cut your roll and pull a test strip at 45 minutes. If it's not close to what you want add 10 minutes (or multiple) to the time for the next strip. Contrast changes take about 10 minutes.
I just got my TFX2 and am looking to develop a roll of Tri-X within a night or two.