I tried espresso grind settings with the espresso beans. It didn't work for my machine. It was a bit too coarse for that bag of beans particularly speaking for my particular setup. Every batch of beans needs to be dialed in. It depends if you want to do it correctly which seems to be the goal to a degree since you're using a Non pressurized basket. But grinding them at Starbucks is generally going to be the same experience as getting preground coffee from a grocery store or something. I personally would recommend a pressurized basket if that's what you're working with. In all honesty, there are too many variables to make it work. Your set up, which beans you are going to be using, etc. It's best to fiddle with one variable at a time. So if you do want to do it this way, I'd keep all other variables the same except the grind size and work from there weekly and see how it goes.