I have Atomic Hawx 80 boots that I bought from a bootfitter at the beginning of last ski season while in the US. I love the fit and find them extremely comfortable, but since the purchase I have made improvements with my skiing. I would say I am somewhere between intermediate and advanced, and I am 5'11 160 lb/73kg. I ski almost every weekend at the Honshu and Hokkaido resorts here in Japan.
Usually I find for a certain tightness the boots will be fine on groomers and I can maintain my form well. But for the same tightness of the boot, once I go off piste my ankles swim around a bit and I often lose my form in the deep powder. However, when I tighten each clip by one notch, it stiffens the boot nicely to ski through the powder. But then I go back on the groomers and the boots feel far too tight. Should I be using a stiffer boot? I want the optimal functionality, but I do not want to have to tighten/loosen my boots continuously throughout the day to achieve that.