I have a recurrent problem with streaks when developing C41 in my Jobo CPE2 with 2521 drum. The streaks run vertically (= in the direction of the axis of rotation) and are purple on the scanned picture. I do a presoak for 3-5 minutes before developer. The rotation speed is max (2). The amount of liquids has been 270ml or sometimes more, and they have been quite fresh. Last time I loaded the 2509N reel with 6 4x5 sheets - 2 had streaks, 4 did not.
I have googled this and found several answers, but the only answer that might apply in my case is that the drum either is not perfectly horizontal or the magnet (which the drum is coupled to - I don't have a lift) is not perfectly aligned.
Is a poor horizontal alignment and uneven rotational movement (slight wobbling around the axis of rotation) the problem here? Any help is appreciated.