Wallie,
How much smoke are you producing from the gas burner?
a better head of smoke
It sounds like your trying to produce too much smoke mate.
Little and often is what you want from a cold smoker.
If you look at Dave's (saucisson) threads on the subject you find a wealth of information.
Apart from its cost Gas burns putting moisture into the air which condensates on the cooler food and inhibits smoke penetration.
I use a hot plate(converted cooker ring) in my hot smoker which smokes and cooks at the same time and it works great for this purpose.
I tried turning the heat setting down to minimum for cold smoking and it produces too much heat and not enough smoke.
I think it was Dave(saucisson) who came up with the soldering iron idea which produces a small amount of smoke all the time and not much heat.
I'm going to be trying this idea in the spring.
Lemon.
PS are you using the hotplate inside or outside the smoker?