The 6.5 is the minimum feed rate. there will be another screen under the gear that. it is an offset calibration. You will need a dependable ambient probe (not the ones that came with the grill)
Check this video out.
I had an issue with this too and had to set my offset a bit off from factory.
You do realize that the password for that account is not the same one for their website right? you have to create a new account for the APP. The APP works fine for me except for the alarms.
I know this is old and you probably already tried it, but the screamin' pig rub has a fair amount of spice to it. I like it, but the family can't eat spicy.