Tailwind, I've toured on all sorts of setups from K2 Fours with Trekkers, to near-rando Trabs to OG Cochises. Based on where I ski these days I've give up on skinny skis for the exact reason you stated. For long days I use Zero G 105's. They're a bit heavier than your K2's, but they handle too-hot spring snow so much better than a skinnier ski. And frankly I just prefer a longer radius than you can find on most skinny skis. I sold my Zero G 85's because I too often regretted bringing them when snow got manky at the end of a long day.
Now, if I skied on a lot of volcanoes or anywhere that requires long periods of sidehilling and kickturns, I'd still have a skinner ski in the quiver because that is when their efficiency really gets amplified. Another factor is how quickly corn or spring pow turns into slop. In some ranges perfect corn can last many hours. In Colorado the sun tends to kills corn fast. And If the top of your line is perfect, the bottom is often way past its prime. I also infrequently ski places that involve long stretches of steep skinning these days, because most mountains near me just aren't shaped that way. When I was on the East Coast (where the corn often lasts all day) I always had a skinny touring ski, and I still keep a pair in the Dolomites (where I have family, and where skinning up lower angle couloirs common). I'd say it's all about making tradeoffs that fit your goals and location.
Whether or not you can ski fast and in control with ultralight boots is more of a skill issue. It takes time to adjust your skiing style, and you need to be pretty decent at skiing to be able to stay centered while being bounced around without a big stiff boot to help you out. If you keep at it your body figures it out. Fit is extremely important (sound like you're having issues with this), and a wider ski in sloppy snow helps a lot. Ultralight boots with a huge range of motion and minimalist bindings can be great even with wider skis.
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