A 3 pound chuck should have cooked faster than what you did, but, 225F is slower than I generally cook. I am sure you need to check the probes and make sure they register temps properly. Fill a glass with ice, and then add water, stir as if making a cocktail. Put the probes into the water for 30 seconds and it should read 32F or close.
"perhaps...but then again...maybe not..."
careful there son, those ribs are boiling hot...
(='.'=) Here there be bunnies...
Pacific Rim BBQ
Bob's Brew and Que