When I first opened up the Mamiya TLR issued to me as a photography student, a piece Ilford paper was stuck inside it. Inspired by this early experience, I try to remember to give the interior of the camera an inspection and a good blast with my Rocket blower with every film change.
I have more trouble trying to remove those Ilford tabs in the darkroom than anywere else. I can't seem to peel or tear them, and I don't dare use my knife in the dark. I have started removing the lick-and-stick paper tab before I go into the darkroom, using a rubber band to temporary keep the roll from unwinding. With Kodak tabs, I have the other problem. My first two rolls of Kodak 120 film - one Tri-x, the other T-Max400 - the tabs would not stick - but I had my rubber bands handy in the camera bag.
You get nice, wide, even gaps between your frames with that Rollei. Some spaces between my Mamiya frames are almost as wide as yours, but others are less wide - maybe only 3 mm.