Have you tested the air flow through the pipe? Way back when I did my review of my first lion I did a similar modification with a dishwasher drain hose. The air flow is sufficient for lower temp cooks but it just could not push enough air to keep temps real high for a hot cook.
I was stripped by Guerry while he was wearing a skirt
Proud owner of the PentaZero
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“I dream of a better tomorrow, where chickens can cross the road and not be questioned about their motives.” ― Ralph Waldo Emerson