Make sure all your connections are tight, use soapy brush. Turn on completely, half-way is useless. Turn off whenever you stop for more than a minute or two. You will be through the little bottles in no time. I hate using little bottles, but sometimes I have to.
Is that true about have the gas turned up all the way on the disposables, someone told me once that all you need is a audioable hiss from the gun. I have done a little bit of welding and it looked OK.
What does the weld look like if there isn't enough gas coming out of the gun.