Tried a pair of boneless turkey breasts tonight. Overall turned out pretty good. The only problem was it took much longer than I planned. I kept the temp between 230 and 250, with a short duration up to 270 when I went to the store. For some reason these 2.5 lb (x2)breasts took 4 hours to get up to 160*. And this is after foiling the last half hour with the temp at the grate bumped up to 310*. The temp just hovered at 150* for the longest time. Any ideas why it took this long?