good work, post some pics of your setup
84F is on the high side. jars might get condensation. high temp speeds growth a little but also dries out the cake faster. 80F is high enough. set a heater at 80F and get 78F in the tub.
some winter mushrooms, at 64-65F, colonized and fruited kinda slow, but it happened.
high temperature also speeds up growth of contaminants, if jars get green spots, you'll know.