I use a slightly different setup in my #1. I'm using the expandable oval tube version http://www.amazenproducts.com/product_p/oet.htm. I have had to play around with it over 3 cold smoke salmon sessions to get it to work for me.
The first time, I had to re-light it very 30-45 minutes to overcome the oxygen starved seal of the #1. That was a PITA over the course of a 3 hour smoke.
The second time, I slid the drippings pan out to where the curve at the back of the pan was just behind the hole on the bottom of the smoker, and went out every 30 minutes and blew along the drippings pan to create some added airflow. Only had to re-light it every 60 minutes. Still a PITA, but not quite as much.
The third time, I slid the drippings tray out the same way and set up a very small fan in the front of the tray pointed toward the hole (the kind people put into A/V units for a little air circulation http://www.amazon.com/AC-Infinity-AXIAL-Muffin-Cooling/dp/B009OXTWZI?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_search_detailpage). It worked like a charm. 3 hours of uninterrupted cold smoke, and the pellets were almost all consumed, unlike the other times when around 1/4-1/3 of them were not.
Hope that helps.