That's weird that you say spitfires get flatspots easily. I love to pivot/slide some of my tricks like fs flips and 180's/360's and i don't feel the slightest flatspot on my wheels yet... Bought them about 5-6 months ago I'd say, been skating on a regular basis and i don't feel any flatspots whatsoever... Maybe I'm just lucky, or I don't power slide enough haha