Non ethanol or not ??

Best advice is don’t take the POs advice on tuning as gospel. Do your own testing and come up with your own results. Some engines at 11:1 will run just fine on 91 octane and some won’t. Do some experiments and get familiar with your new engine and come up with your own conclusions on what it likes, needs, or runs best on. There are WAY too many variables for anyone on the internet to suggest an appropriate octane level for your engine without knowing the particular build details of said engine.