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Head Retention Problems

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You may have just figured out my problem as I was struggling with my mash temp from the beginning.

I started at 165*, but it dropped into the high 140's, and was hard for me to get the temp back into the mid 150's. I checked every 3-5 mins for about 1/2 an hour, and slowly turned the heat up a 1/4-1/2 of a point (the knob registers 1-9 for temp control), and it was then that, allowing it to sit a moment my temp became 180* on my hazelnut.

My stout didn't seem to have this problem according to my notes as I had done a better job keeping it between 150-160*. My OG was low and FG was high.

Both beers had stalled out, and I assume that, while I was in the hospital and SWMBO was "taking care" of them for me, that the temp got into the 70's and so she put a lot of frozen bottles into the cooler, which may have been too much. I did add sugar and gently stirred, but it didn't seem to do much for the stout.

It's ben quite some time, but the other day I tried another and the taste has improved, though there's not much carbonation at all. I had run out of corn sugar (2.9 oz of the 4.3 I needed) and so used some brown sugar. I didn't use quite enough, but it should be much more than it is.
 
that would explain the low OG and high FG, 165 is really pushing it and 180 is, as they say in monty python, RIGHT OUT! you essentially performed a mashout and denatured most if not all of your enzymes right there.
 
Yea. It's surprising that it's maturing OK.

I see the many mistakes with the hazelnut, but it doesn't make sense why I'm having problems with my stout. Outside of fermentation temps I did a good job from what I can tell.
 
luckily most conversion occurs in the first 20 minutes at sach temps so even if you burned all your enzymes at 180 most of the conversion had already happened.
 
To begin with I have to assume how much Briess used in their extract. The way I am approaching it is that they used 5%, their max. So if I use 1/2 extract I'll use 3% in my mash, though I have considered assuming their number is lower, but does that really alter my added amount enough to concern myself with? And does using 7-8% make it noticeable?
 
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