I had kind of the same problem with my offset. The problem ended up being fixed by increasing the exhaust size. I went from 2 4" pipes, to 1 6" pipe. made all the difference. Now it takes about 30 minutes to get up to temp.
I would remove the 3 little exhaust pipes you have. Replace them with 2 larger diameter pipes. I would put them in between what you have now.
I would also move the inlet from the firebox to the chamber to below the grates. Plug the whole up top and put a new hole behind and up to the bottom of chamber.
Good luck!
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Chief cook for P B & j's BBQ Team/Dubbed "Skippy" By the legendary Mike Davis
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