I've just started using the AP reels for 120, and I like them for that film, due to the larger input flanges. Otherwise they seem very similar to the Paterson reels. They will, of course, work in the Paterson tanks.

Is there any chance that the problem reel is warped?

You might consider loading a scrap roll of film in the light, to see if you can observe what is happening.

Good steel reels are good (I prefer them for 35mm) but if you have the AP tanks and like them (or Paterson tanks) than it would seem a shame to give up on them over what might be a single damaged reel.

Matt