I would check the dispense temperature of all 4, if there is a major difference between them,then temp is your problem. What temp is your glycol and is it cold enough to freeze your beer ? 26 degrees. Check for a kink in the line at the coupler and at the shank, that could cause the problem. Swap a coupler from a good pouring one with the foamy one and see if that makes a difference. Try to isolate the component that is bad and correct it from there.
Beer is good
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