Parameter 3 is ramp rate off to on remote - set to 0.
Parameter 7 is ramp rate on to off remote - set to 50 (for 5 seconds or 50 * 100 = 5000 milliseconds).
I can’t check till later but you can put a transition parameter into the automaton to set the time as well. I have lighting I transition over a long period of time doing this to gradually turn the lights on as the sun sets.
Yes, it seems that the HA transition parameters for the light must somehow trump or work with the Blue light switch ramp/dim settings. I will need to test this our. Sort of like 2 different feet on the gas or break pedal.