Your fixture template looks ok although no need to create a fixture template with only dimmers. You could just have patched 7 generic dimmers. The goal is to test the fixture and learn how it works. Then once you understand it, you create the fixture template.
If it's not working as expected by sending the exact values as you're doing now with dimmers, I think the fixture's user manual may have an error. You can contact the manufacturer or try different values with the dimmers until it works. I'm saying this since you're the 2nd user to have problem with this fixture.
For example, try setting the function speed (channel 4) to 50% and changing the value for the channel 2 which controls the mode.