N+1 with D-23 and Jobo

Are you using a sufficient volume of developer? Because developer activity decreases as the film is devloping, you may be reaching exhaustion before you get to a +1. If you are able, try adding 50% more developer to the drum. Or if you're unable to do that, use the devloper undiluted. See Steve Anchell's indespensible Darkroom Cookbook, page 114. If this doesn't work for you, toss the Jobo and devlop film in trays. It's easier than you think.

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