@ Jim, the original roast wasn't bad, certainly not running out of propane. You see me experimenting with Designer and its wiggly rendering of the BT curve that extrapolates to ROR. I'm trying to make suggestions for adding instructions to the Quick Start Guide. Hopefully as my and others' use if Designer gets better curves they can replace these.

What I'm hoping is to use Designer to create a background curve so I can shape a mediocre roast into a much better one with fewer trials in between.

Got it Gary! Thank You for helping to move the Guide forward.