This is a section, of a 6 x 6 FP4 neg (approximately 25% of the neg) exposed at box speed, and developed in Paranol S (Rodinal), 1+50 22mins at 20 degrees, 30 secs agitation then 1 inversion/ minute. I've not used this developer until recently, but all the last few rolls have been fine, but they were all 35mm. These are the first 120 negs I have processed in Paranol S. I have progressively cut the recommended time, as the first time, negs were fried and contrasty at 30mins. I have reduced agitation from the recommended 1 inversion per 30 secs to 1 /minute too. Might this reduced agitation cause these streaks which appear on most of the negatives, but are generally more subtle than this example which is the worst case.? Might there be another cause?