Did you get this figured out? Which Bailey extruder system do you have?
We have 3 extruders in my studio - manual Bailey wall mount, free-standing Bailey pneumatic, and a custom 14" hydraulic extruder.
Does your extruder function without any clay in it? Obviously it should.
If it's the pneumatic extruder - you have to press the foot pedal and let air through in order to see any reading on the regulator.
I don't really know how you can jam up a manual extruder unless the plunger gets stuck/wedged from an object or misalignment.
Soft clay is the key to getting clay to come out, less resistance for certain shapes. Lubricating with water on the clay/in the hopper helps tremendously. Bailey recommends spraying WD-40 on the wood die plates when you first start using them, i've noticed it help slightly. Beveled edges seem to help on some shapes too.
I have all Skutt electrics in my studio. The new Skutt control boxes are awesome, I have only one (all others are 20 years old!!!) - but it allows you do do diagnostic stuff from it. Skutt website has tech info and links to videos on how to test and troubleshoot. Also, their kiln techs DO answer the phone and will help you out with questions.
Try Ferro Frit TR-1132. It's one of the few remaining frits with "lead" contents that you can still buy. We use it in our studio as a sub for a few older items we can't get anymore. Testing definitely required, but at least its a place to start!
Funny thing is I'm currently staring at a 5-gal bucket about half-full of Litharge that I recently found in my storeroom from a bunch of things donated a few years ago. Fun-Dip time, yum!
I've been buying the pint jars lately because of the solidification issue. We used to consume a decent amount of SS in our studio and I was getting it in gallon size, but now I hardly see it being used. Last time I bought one of those gallons was about 6-7 years ago and last year it turned into a solid mass in the jar. It was the type of plastic bottle that looks like a jug with handle, not the wide-mouth style 1gal. Stored on a shelf with everything else. I'd never heard of or seen any products do this before, weird.