Just go with it this first time. The next run you can make the adjustments...you'll be able to see the differences between the two different ways you calibrated.
I posted to your post on the NFC bday chat thread, also so check it out.
Okay, thank you!! That makes sense and is helpful. And okay I will!!
Oh and I did test the seal on a different, empty back, and it was good, so that’s a good sign, right? I know not every bag is the same but should mean the others are probably airtight too?