I use exactly the same tanks and reels. I prefer the Jobo because when the balls in the Paterson are blocked (Calcium) you will have a problem.I have a Jobo 1520 and also a Paterson Tank System 4, both with the standard plastic reels. To make matters worse, I am gradually losing feeling in my fingertips due to an old neck injury
For loading one 120 roll film in the 1501 reel it will take 30 seconds. The reel must be clean and no contamination with a wetting agent and completely dry. Also the way you are loading is important. You had for this already some advise.
I am dealing with the same defect: Car crash from a big truck hitting from the back. Result: Spine damage and whip lash. Continuous under fysio treatment. When not: Loosing all feeling in hand/fingers. So I know what you have to deal with. Under these circumstances it's impossible to do this job.