Wait a bit. The bulk (obvious) fermentation happens in the first couple days, but it is still fermenting. Plus the yeast are cleaning up the wast products to give a cleaner taste. If you have the time, I would think about letting it sit in primary 3 weeks to mellow.
That mash temp does seem a little low. You could also have had what I think happened to mine if you didn't do a mashout. The wert cooled as you drained the tun and sparged
Verifying my thermometer isn't a bad idea (even if it is supposed to be certified)
I would probably wait until I had a bit of wert in the pot before I turned the heat on low. The temp would just need to get to 180 or so and hold steady
I verified that the temp stayed steady during the mash, so it wasn't that. However, now that I think about it, the wert would have cooled after it was siphoned into the pot. Especially with 2 sparge steps.
I think that I will put some heat on my pot next time to heat the wert up and stop any...
So for my 2nd all grain brew (after 8 months of down time due to moving) I went for a relatively simple Scottish Ale. Shooting for an 80/-
my Efficiency was slightly higher than I anticipated at 72.3%.
This gave me a post boil sg of 1.059
I was expecting the fg to be in the range of...