A couple of things. Get some heavy duty foil so you can line the water pan, makes it easier to clean up.
At that temp, it's odd that your wood is burning that fast. I usually always use charcoal and use the gas for an assist in the colder months.
I also always soak my wood in water for at least a half an hour before I smoke. That's another debate in and of itself. I also use chunks more so than chips. If you're getting that much white smoke, you might be using too much wood/chips. It's easy to use too much. As long as you can smell the smoke, it's enough. Getting the TBS is the best obviously. So, a small handfull of chips or a couple of chunks is sufficent in my experience. Restock as needed.
Also, take the thermometer out of the hood. It unscrews with a wingnut underneath. Do the boiling water test on it to make sure it's accurate. I just make a mod to mine and drilled a hole at the top grate level and put in another tested therm.
I have never done a solo "gas" smoke which means I always put the chunks on top of charcoal. So, your wood may be burning too fast if it's in the charcoal pan by itself and you're strictly using gas. If that's the case, perhaps you could do a charcoal burn, leave the ashes in and then place the wood on top if you want to go just gas. That would probably help.