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I typically just use apple for birds. I like cherry for beef. You don't want a real powerful wood for turkey and I find apple gives me enough smoke flavor without overpowering the meat.
Sorry bigsmoketexas, I think my reply will be too late now. But I would just use the 4-6 chunks I added from the start of the smoke and not add anymore. Hope your turkey turned out good :) This was mine after 6 hours in the smoker