I ride 100 flex atomics, and I'm pretty light (145lbs) and I definitely overpower them charging.
2 flex Full tilt tongues are like a 60 flex. you might as well just click in with skate shoes.
Soft boots are nice on hardpack days for shock absorbtion, and are great for slow speed small park features.
Stiffer boots are much more supportive, and much nicer at high speed, and on bigger jumps.