That looks correct, do you have anything in the logs when you are trying to perform these actions?
As far as your button 6, You should probably set those to “Stop changing” the lights. Set button 8 to start raising and start lowering.
Button 8 is when the button is being held. Button 6 is when the button is released. I know it is confusing, but that was kind of the consequence of platforms not natively supporting things like double press, triple press, etc. It would be nice if SmartThings and Hubitat would support 3x, 4x, 5x presses in their capability options.
Example:
