I’ve got ttx air too, great shox, but highly recommend thinking about switching to Ohlins coil, its mindblowing)
M3 forks are similar to m2 forks, the difference is in spacer in negative chamber, which u have to remove on your own in M2, so if U find a good deal on M2 - take it. In Ohlins forks it’s difficult to set up pressure in cameras which will suit u, cause their manual numbers work for nobody

) and the point is to find that balance between plush/bottoming out according to your ride style. I also installed 180 travel upgrade, its much cheaper and easier to change Ohlins forks travel than others.