okay,
kits instructions are getting better but, especially with all grain you can never take the expected targets 100% seriously.
If the instructions had you mashing at 150 and you hit that number, I would also take a moment to calibrate your thermometer. If possible find a NIST certified glass thermo to calibrate against at mash temps. so heat some water till the certified thermo read 150 or so and then check your working thermo against it.
If you do not have access to a certified or other known good thermo you can test it in boiling water (should be ~212, adjusted for your altitude) and ice water (should be ~32) this won't guarantee that it's right at 150 but it might show you if your thermo is way off. and if it's the same amount off at 32 and 212 you can at least try that adjustment next batch and see if you get more accurate results.
[/quote]
I use a Thermapen to check my temps when I brew and it is spot on. One question for you. When you said earlier that you add 10-20% munich in your porters, is that a percentage of the total grain bill so that I would add somewhere between 1.4 and 2.8 lbs or do you figure it different?
[/quote]
Yes, a percentage of the grain bill. I would likely add about 3 lbs to that recipe. It would be a good way to bump the total grist up to account for your lower efficiencies as Tom suggested actually.