Sitting in my house trying to remove the hose routing on mine ditch bank flail mower. But my hoses are not just laying around as yours are. Will see about taking pictures and posting. Bought mine this spring being a Phoenix made by Sigma if memory is correct. One thing suggest you check be sure the pto shaft that is not binding when the mower is at full extensions and retraction. Easy to do with someone operating the controls with mower running at low rpm and someone outside the cab to listen for a clicking or light tapping sound.
As to float being a must or greatly need option, my tractor has float on one remote which we use on the tilt for the mower head but my third arm mount has slot to allow for floating of the mower itself front to rear when you lower it to cut. If yours does not have that, you might could use some chain for third arm to allow float action as many do with a rough cut mower. I have used a boom mower with flail mower a fair amount for at least 16 years and like them. Don't find I mow as fast with them as a rotary offset mower but not throwing debris and leaving more desirable chipped type debris, I also find my right hand does not leave the remotes far or for long when on ditch banks.
Hope you enjoy your mower. Hookup takes a good bit so much to do and verify. On the stand that can not be pinned in the up position can it be flipped upside down and stored that way coming in from the top of the holder?