Last weekend I got 3 bone in chicken breast. I askedthe butcher to split them in half. Each halfended up weighing a little over a pound. I marinated them in itallian dressing and put them in my brinkmann trailmaster at 225. 4 hours later, with consistent temp, the birds were only at 135. Why could this be? I mean, even in the oven at 225 the chicken would be done wrll before 4 hours right?