I travel to Colorado a lot and hit some high altitude Jeep trails. Last time I was there, I had my Yuneec Q500 4K. I took off at 12,300' in elevation. It flew but not well. When I went to descend, the quad started sinking in its own prop wash and couldn't seem to get itself out of it. Had a fairly hard landing on a slope. Just broke some props, fortunately. I'll be going back soon and plan to bring my P4. Has anybody flown their P4 at high altitudes? 13,000 to 14,000 feet? How does she handle?