Mr Toad's Pork Loin

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Yesterday I cooked my second pork loin based on Mr. Toad's method. I purchased a whole pork loin sliced it twice length wise and then cut it into three sections. My problem is that it took almost 3 hours to get the inside temp to 145 at 350. My first time took 2 hrs and 15 mins. All of the posts I've seen indicates that a time of 1 hr and 45 mins to 2 hrs is adequate at 300. [p]Does anyone have any idea why it is taking so long. My thermometers check out OK.