I would suggest that you be very familiar with the Behmor before placing JBM init. I am assuming that you have at least 20 to 30 roasts under your belt? I am nudging over 60 roasts and if it were me I would be watching it like a hawk!
Good luck but I would be doing a small roast of say 250g and 1IbP4C setting. Will be interested to see how this pans out :)