First time developing 120 HP5+ problems

Tried developing a fresh roll of 120 HP5+ (rated around 200) with fresh Arista chemicals. Film loaded in a brand new changing bag. Negatives had strange random areas of slightly sepia-colored dark shadowy stains on them - mostly in the center areas of the film strip along several frames. The stained areas have soft boundaries and variable density. The areas also showed up in some areas at the clear end of the roll. Other than that the negatives look OK - nice exposure/grain/contrast (all 12 shots identical woman standing in front of a house). The manufacturer text on the film edges looks crisp and nice. I processed on spirals in a hand-agitated tank. Arista developer 1:9 at 72 degrees agitate 10 sec every 30 sec for recommended times. Water stop - 4 quick changes of water. Arista fix 1:9 2 minutes agitate 10 sec every 30 sec. 5 minute water wash. Arista Universal Hypo Wash 5 minutes. 5 minute water wash. 1 minute dunk in distilled water with Edwal LFN. Hang to dry. I actually cut the roll into 3 pieces on 3 separate spools and processed one spool at recommended time of 6.5 min, one at 30% less develop time (4.5 min), one roll with 30% more develop time (8.5 min) just to experiment. Chemicals were brand new, one-shot use for each spiral. Stains appear on all 3 trials. Any thoughts on what I might have done wrong? Thanks.

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