Bugger, have to find another way then, maybe a new bag.
Of course they write you should not leave the boom attached, eventhough it does not matter, as then they are home safe if something goes wrong eventhough it would be your own fault
Got so many kitefoils and surfboards in my car, that I usually like to have some protection on the wings when rolled up, so they dont get cut from fins/foils.
I also roll the wings wet sometimes, when leaving, just on top of everything, and they will dry themeselves eventually - but sometimes I need to protect a bit more.
Never take the booms off, maybe I disconnect the two front connection lines if I store the "old" Duotone V1 fully in the bag, yes, but thats it.
My wingfoil (board+foil) is always fully assembled in the car, otherwise it would be a hassle to mount every time, these 4 screws no way I want to use time on that
But you are right, the full length bags are too thin in the end for the V1's, for a quick full packdown yes, they should be made conical like the Ullman's.