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If you have a low flame on your grill, it may be the way you are turning it on.
All new propane grills have a built in safety on the regulator. You need to start the grill in a specific way to keep the safety from shutting down or lowering the amount of gas that is allowed into the grill.
Shut off all burners and the propane tank when you finish grilling. When you are ready to start grilling again, lift the lid. Make sure all the burners are off. Turn the valve to the propane tank to full open. Wait at least one minute before you turn on the burner to start the grill. After one minute, you can start the grill. This will bypass the safety and allow you to get a full flame on your grill.
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