If it's a small fan not faced directly on the drying plants you will be fine.
The issue of drying to fast due to a fan would be 1 of 2 things.
Either the fan is too strong for the space or it is pointed directly on the plants. Have it moving air on the ground which will circulate air.
It's soil. It's unnecessary to adjust it.
My soil reads around 7.5 my water is 7.8 and thats what I put in there.
I highly doubt it's a ph issue you are experiencing.
Just keep in mind if the foxtailing is genetic then that weed can absolutely be fire. Including the foxtail. In this case it's just another shape of bud. Ain't pretty but smokes the same.
If it's caused by heat stress you can affect the quality of the bud simply due to a stressed unhealthy...
I have done similar.... I grew up in queens NY. During the winter. A garbage can lid, a rope and a car bumper.
A chipped tooth is all the damage I took from that.... that I can remember. lmfao.
Good times, good times.