Celebration Ale Clone (extract kit) White Labs California Ale Yeast (liquid vial, no starter, I know next time I'll make a starter) Pitched at 68 degrees and good activity 18 hours later, got up to 71 degrees for the first 4 days of fermentation, but from days 5-10 its been around 64 degrees (house got cold and didn't have a temp control system) and the last 2 days have given gravity readings of only 1.021. I aerated by pouring back and forth between the ferm bucket and bottling bucket and shook the bucket up before pitching, which is what I usually do and seems to work well for aeration on my other batches, but I did just order an O2 aeration system for my next batch.
I also did just get a Fermwrap and Johnson Digital Temp Controller to help in temp control during the colder months. My question is would it work to swirl the bucket a bit to resuspend some of the yeast and use the Fermwrap to get the temp back up to 70 degrees to help it get down to a FG closer to the estimated 1.012? I don't want to create any bottle bombs with a 1.021 gravity reading. I contacted the store (Brewer's Apprentice in Freehold, NJ) where I get my kits and they weren't to sure if that would do anything, but shouldn't it help the yeast finish up since I feel like the yeast is probably just dormant from the colder temps? White Labs suggest 68-73 degrees. Or is there anything else I can do to help it out?
(Side Note: Read in another post that scorched wort can create unfermentable sugars resulting in a higher FG, and yes I did slightly scorch my extract cause I left the heat on for a minute when adding it, so this may be the reason)