Yea, heavy frost on the windshield this morning. At least that means the lawn will stop growing. With your plan, we can test in about two weeks, but don't plan on any movement or Kmeta until the test comes up negative and you wait another week or two. If you can't maintain a higher temperature downstairs I'd move those carboys upstairs. Your MLF might be inhibited if you start dropping below 65*F or so, I'd even aim for 70 if you can (that's right, you have a brew belt or something like it, maybe your belt/pad might help?).I did taste it. Very potent. I swirled it in the glass for while then let it sit in the glass for about 10 minutes. Probably best to wait a couple more weeks before testing it again.
The 1.5 bottle has a good bit of fine lees at the bottom of the bottle while the 375 doesn't seem to have any at all.
Possible plan: Wait two weeks, test and maybe rack. Wait another 2 weeks, then Kmeta and let it age a year (dosing every 3 months).
I don't know about out your way, but it got pretty chilly in the basement last night. If I close the doors to the wine room, it will easily drop to the mid-50s.