OK, so my numbers were off and after reading here I have a question about getting more accurate numbers after you pick the specific heat number for your mash tun. I have very well insulated kegs as my tuns and can now perfectly control my HLT, so if I have accurate numbers for my MT I should be right on. I went with my original Stainless Steel numbers of .120 and my newly weighed weight of 40 lbs for my first batch post-upgrades. I was way off so I went back and adjusted my mash rest temperatures to reflect what I got during the session. I then changed my Specific Heat number until the temperature of my infusion water was what I actually got during session. So, I got my brewery relatively close now and I am wondering. Which number makes more since to skew to make my actual numbers during a session match up? I did a little experiment before posting and found that at each increase or decrease by 1 lbs at the same specific heat number was only .3 degrees difference in my infusion water temperature. The same infusion water temperature difference held true when I kept the same weight and changed my Specific Heat of MT number by .01 higher and lower. So, which number makes more since to skew and which one should I leave alone? Does it matter which one I skew? As the programmer, I ask you since you know which one plugs into the program in more detail. I am glad I got the numbers to match as close as I did, and it will take a couple of more sessions to know how to tweak. I just thought I would ask so I can get to it. Thanks Brad, and hope to hear from you soon.