Yeah, mine are the same way. They are MSD. I use long needle nose pliers to take them on and off.
It's not really a screw but a hose fitting for the vacuum hose. I would assume that it needs a specific clearance inside which is what limits the amount of vacuum depending on how far in it is turned. So I think really the solution would be that they make the threads shorter on the fitting so that it cannot be screwed in far enough the damage it.Can you replace the screws with shorter screws?