This is my exact same sop, except substitute heatpad for incubator. My pad gets things about 85 or so at room temp.
So I do smaller runs, about 100g at a time for personal use, and I’m finding if I jar everything up at about 50ml of liquid it gives me sea salt sized grains after about 4 days to a week.
My normal return is about 20g total of crystals and hte a run, so that is 20g per 50 total volume of liquid prior to capping generally gives me sea salt.
What ratios have you done? What was the result?