Has anyone ever notice that the holes on either end of the swivel are different sizes?
Yep - they are.
I have a theory about this: we lose a little lpm using a long hose; by reducing the size of the hole on the output side of the swivel, it increases the pressure. Works just like the nozzle on a garden hose.
Anyway - look closely at your swivel.
Likewise, maybe I use a different brand and that is the reason. I have no additional hosep either that's attached to my cannula.