I agree, too many holes. Not enough gas can come out and my thinking is that it is sucking air in the other ones. I would try half the amount and start from there. Hole size seems fine.
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My arsenal, Stumps Clone, Two Modified offsets, open pit with grate and rotisserie,UDS, Weber One Touch Silver 18.5" kettle, Chargriller Pellet Grill, 36" Blackstone Griddle
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