This was my though as well. Between the altitude and 91 octane I probably won't even run into knock. 91 is only $0.10 more than 87/88 here, and $0.20 more than 85, so its not a big deal for me to run it.I was poking around the ‘ol google and didn’t find any great answers on timing set up. I’m not too sure what you can do other than get it as hot as possible and listen for audible pinging or knock. Being at altitude, you can advance the timing at least 5* though without any issue.
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I did see some posts where guys were running 10-12°. One guy I think was even at 15° I believe. I just don't know how far you take it before you just arn't doing yourself any good anymore. I guess it depends on how much the ECU is adding and when.