Help! I am cooling a 2.65 lbs eye of round roast. Directions said to roast at 475 for 7 min per pound and then turn off oven and let roast sit in there for 2 and a half hours. Roast supposed to reach 145 but mine is at 109. What do I do to fix this and get the roast to medium? I put it back in at 350. Is that a good idea????