I had the same thing happen to me , a couple years ago. Sorry to say I don't remember how to fix it, but I did call American changer, and they talked me through it.
I just run 1/4 line for chemical and air right above foam brush boom using just a brass tee with a 3/8 line coming out. I have great looking foam coming out of the brushes.
Go Buckeyes, Do you use Hoffman mint , Van Brook or someone else? I ,gave up on Hoffman mint because just what you said.
Never had a problem with Van Brook, I just ordered some 8 weeks ago, and had them in a week.
I tried the Hog Daddy , my thought is, it was like using a wet mop. Got a customer compliant about the new Hog Daddy so I pulled it, and went back to Erie. Tried Universal too, wasn't happy with it either. Seems like Erie works the best for me.
I went from quarters to dollar coin, found out fast that people would come in to just get the dollar coin , they said they started to collect them. Switched to
secure dollar tokens. Best thing I did.