I think that there is a mistake in the Robe T1 M3 library. The tilt range is inverted with reality.
Please check the following pictures to understand what I mean. One is a screenshot of my show and the other one is from the Robe T1 manual. The output for this fixture's tilt is 1/53. You need to know that the fixture have no tilt inverted in Patch and is from the last update library's file.
Let me know if this is right for you and if I can change it in my shows to be good with an upcoming update
I did not check if this is the same with M1 and M2 library
After some tries and according to the previous pictures, I think that this is the right change to do : Invert the dmx's min and max of the tilt. I didn't try it in real at my theater but I expect to do it on Monday
Please let me know if this is right for you !?
With the picture, It's better