Bought a second thermometer to put in hot liquor, and one in mash tun. Added my 168 water trying to get 157 mash temp. When I added the water it went to 170! I think there is a problem with one of the thermometers ( obviously). My question now is, I wanted a high temp, 157, to yield a more sweet wort for an oatmeal stout. I hit an initial high temp, but dropped to low, am I going to turn out dry or sweet? My temps every 15 minutes go like this 170; 140; 152; 148; 150. Thoughts?