In addition to what Lindy said, make sure that all gas is off before turning the valves on. There is a safety device (flow limiting device) built in the tank valve that detects leaks......or an open appliance valve. If the device senses that there is not enough back-pressure, it will restrict the propane flow.
Your stove burner performance indicates that is what might be happening. Make sure all of the burners are off, plus the water heater, fridge, furnace and a outside grill should all be off before opening the tank valves.
Check out about 1/2 way down this page for the fix: http://www.motleyrvrepair.com/propan...ty_and_use.htm
Chap , DW Joy, and Fur Baby Sango
2006 Ford F150 Super Cab 4x4
2008 Surveyor 263