So I did a sirloin tip roast tonight on my Traeger the taste was delicious but it was tough... I smoked it on 225 for 90minutes until the temp was 134* the turn the grill to high and reverse seared it for 5 minutes on each side let it sit for 10 minutes before slicing! It looked and tasted amazing but was tough!!! Any idea what could have happened or what I did wrong?