Just about every spud in your propane system (and your "Extend-A-Stay) has a flow limiter in it and they can be drilled out, which will eliminate that problem, but your 20# tank may also have a limiter in the OPD valve. I had similar problems and when I talked to the engineers at Manchester Tank they told me the following:
When the OPD valves were designed, a by-product of the new valve design was that some valves also gave them a flow limiting capability. They recommended that I search for tanks that had the word "Italy" cast into the valve body just under the tank valve shutoff handle. These tanks had a different valve that did not give flow limiting actions, but are still completely legal under our law. I bought 3 of these tanks in Lowes and have never had a shutdown problem since. Of course, you can't just trade bottles when you need a refill if you get this type tank.
