With that temperature and humidity, I would think that they would recover nicely without additional effort on your part.
Keikipro is for sparking growth and the formation of keikis, not roots. You need a rooting hormone concoction like SuperThrive, K-L-N, or the like for that.
By the way, overwatering, per se, is not the cause of root rot. Suffocation is. Sounds like you need to use a more "open", airy medium.
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