You mention a Pyro based dev.
And a second (third ?) hand reel.
Maybe this is due to contamination problems.
May I suggest you clean the reel and tank using a nitric acid bath as recomended in the instruction sheet ? (it worked nicelly on my set which was really black when entering home and they look really like new, now)
As per the elastic band, use it around the reel to prevent the sheets to exit the reel during agitation.