A personal update on using my 5x7 B&W King tank. I'm now getting perfect development with the following modification. After loading the tank, I use electrical tape to seal the top onto the bottom of the tank. When agitating, I alternate between internal rotation and inverting the tank by holding the little cap tightly on top. The electrical tape prevents leakage around the tank.
I was getting a faint vertical streak on my negatives where the non-emulsion side rested against the metal bar in the middle of the negative. The combination of rotation and inversion seems to have solved this issue and produces nice and evenly developed negatives. Since others have not had this problem, I am assuming it was due to either the film or the developer I'm using, or that the fixer wasn't clearing completely. I don't know, but this seems to have solved the problem nicely.
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