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Most discs do tend to fly a little different when your high.lol
I've heard of this and had an in-depth discussion about this a few days ago. The guy i spoke to joined me in a pick-up round and was having trouble turning over his discs. He had just moved to my area (at around 3400 feet) from sea level and had thought that the change in elevation might be the case. I could tell he wasn't just making excuses: he had a cannon for an arm and was very knowledgable about disc golf in general. It was pretty inspiring watching him bomb 400+ foot flat hyzer bombs and be disappointed that they didn't flip over!
So i think there is some truth to discs being more stable in higher elevations but even with that, it's probably just as much your technique to blame. It's amazing how quickly bad habits can sneak in to your game and every day presents a new tweak to the throw.
Maybe try building yourself a high altitude set? Same discs you play but get them 5 to 10 grams lighter. I've switched out most of my 170+ drivers for the same models in the 160-165g range. For example, my favorite disc right now is a 161g Vulcan.
Food for thought.
Well I let someone else throw the same disc and they had similar results. So it isn't just me. Discs are simply more overstable at altitude. That is a fact. I can easily flip a Sidewinder or a beat in TeeBird. However, I am not one of those power players who can flip any disc.
I am in the process of breaking in that disc that I just bought so I will give it a week and see if it changes. A Star Vulcan is not understable for me at all. My Star Vulcan flies almost exactly the same as my Lemon Lake Katana. Maybe a good rule of thumb at elevation is to just add a couple of numbers to the stability rating. So -2 is more like 0. A -4 rating is more like -2.