I still think dehydration is the issue here, especially if they were at 68 all day, combined with some possible root damaged caused by the 22 degrees overnight.
Water will not hurt any, so give it a try, using tepid water can also help. Until you try at least one solution, I would not harvest early due to a perceived problem that may not exist and/or panicking just yet over potential loses. One night with low temps is not necessarily the cause of this issue, if your plant did freeze, the ends and edges of the leaves would be brown due to frostbite freezing the sap in the leaves. This sort of damage occurs immediately and there does not seem to be any signs of that type of burning in the pictures you have posted. To me they look very dry, so too does the substrate.
Go on, give them a decent drink and I am sure they will recover. Doing nothing will not make the problem go away.
I would be most interested to know the result/outcome of a decent drink, if you do decide on giving them one and if you do, could let me know the results please?
Cheers,..... Organoman.