Actually, your numbers in ibrewmaster don't add up. Those pound fractions aren't right according to...math. 9.2oz isn't .6lbs. it's .575. 4.4oz isn't .25, it's .275. Those little changes will probably make a difference. I realize each one is off by the same amount (one high, one low) but I wonder what happens if you put them in accurately. I'm not familiar with the software you use, so I don't know. I can try to plug into my spreadsheet if you keep having issues.