I would not call myself an expert skier but I'm very athletic and pick up new concepts very quickly. My favorite slopes are moderate to steep inclines with hardpacked ice or groomers. I love going fast! I enjoy jumping but typically don't spend much time in terrain parks. I can do moguls pretty well without stopping but I'm not that fast and start struggling and/or stopping between turns when they start getting excessively large. Chop isn't a big deal for me but I honestly don't really care for powder skiing.
I've skied on 2 boots recently. One was just a rental boot with a flex of 60 as I wasn't expecting to ski on that trip and was size 27.5. I was comfortable skiing it but it made my quads burn like crazy halfway down every run. I own a size 26.5, 100 flex boot with intuition power wrap liners and am comfortable with it as well but even that boot may be a little too big. I find that I have to be in the backseat more than I think is ideal to make that boot work for me at higher speeds. I also feel more comfortable with the powerstrap at the top of the boot fairly loose. With the powerstrap tight, I'm off balanced.
I'm sure some of my issue is less than ideal technique...no video to prove it but I'm sure I'm guilty of this. Does this sound like an incorrect flex related issue, poor boot fitting, or just a combination of everything?