Performer deluxe propane regulator blown with 20lb tank

Hi, I have a weber performer deluxe with propane start. I love the thing but being in SoCal and grilling year round, I got sick of constantly replacing the tiny propane canisters. I got one of those adapter tubes to connect a 20lb tank and it's been running great however ive blown the regulator twice in about 6-8 months. its a $70 part from weber. I confirm the gas is coming out of the tank, as well as coming out of the adapter hose, but nothings coming out at the end near the electric igniter. I'm guessing because it's not designed for a full size tank. I dont want to keep buying a $70 part every couple months and also dont want to deal with camping canisters. What should I look for to fix / avoid this problem?