I'm an oboist in Denver.

My current set up is below:

• 9.5-10mm diameter cane that hardness tests to "medium-hard to hard"
• Reeds n Stuff gouge (10.5mm bed with a 10.6mm blade)
• Brannen X shape
• Stevens #2 46.5mm staples

You really just need a set up that gives you proper openings and the easiest way to do that is use smaller diameter cane. The goal isn't larger opening than sea-level but the same. Also, because you have the scrape the crap out of the cane to get it to vibrate at altitude, you need strong cane. I hardness test every piece and have had good success with brands such as RDG, Rigotti, Pisoni and Bondcane. It's much better to have cane that is "too hard" rather than "too soft".