Response to airbells sorted, but now streaking...

I develop all my 4x5 sheets in a Jobo tank (manual inversion) and prerinse many of them. Never had a streak problem. Maybe you are using a too strong developer solution (or too warm ???). Don't agitate too vigourosly, take it easy. When you inverse the tank (while agitating) try to turn it around itself at the same time (an ancient Chinese technique of agitating developing tanks).

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