Sorry I didn't see it
.... its probably me, but that menu looks add, like something is missing I presume you have updated PA3's firmware. I have 7x PA3 Ultra, in which 4 of them controlling 4 of my D5 pumps. I remember whey back I had exactly the same issue when don't mater how I set the "start boost" in PA3 via-aquabus, it would start my pumps and some of the fans at MAX speed for 10 seconds. It took me a while to figure that out that until I connected every PA3 separately via-USB cable first, then disabling "start boost" there allowed me to adjust the "start boost" via-aquabus to my liking.