You didn't cook it long enough........like lots of what we Q "It's done when it's done". you should have continued the cokk til it "probed like buttah", then rested, it would have redistributed all those delicious juices. Cooking at 225 you were looking at a long cook anyway. I'm sure others will chime in with add'l advice.
Keep at it tho, trial and error is a pretty good teacher.
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