^^^^ OP weighs 187 lbs., is 6'. At 165, I'd never call the Supersonic soft, either. But you're right about the flex pattern; it's pretty much a Blizzard signature to have comparatively more stiffness in the front 1/3, comparatively average in the middle, average to below average in the tail. Only non-Blizzards I've ever seen with this pattern are older Volkls from (surprise) around the time that Blizzard was formed using, among others, a few ex-Volkl engineers. And we all started noting that Blizzards were Volkls done right.
So IME the Supersonic hits crud like a stiffer ski than it is, if you just think of all over flex. Also, its snowfeel/feedback, which is pretty high, can fool a driver into thinking it's softer than it is. Finally, IME the Blizzard carvers change characteristics depending on ski length relative to drivers' more than some. For instance, for me the 167 length in the Supersonic or G-Power feels like a more SL-ish hybrid, definitely likes to turn, but at speed wants to be at decent edge angles or it gets nervous. (This is even true for the G-Power at 167 BTW, which is noticeably stiffer.) At 174, way more GS-ish, more serious, can accept lower edge angles at decent speed. And the G-Power at 174 is a solid cheater ski. Not clear which length OP has, but at his height and weight, if he thinks it's really turny and the tip goes left and right, I'd bet the 174.
As far as up-comparing, agree very unlikely the Kendo is stiffer than the Supersonic torsionally, given the greater width to control, conceivable it may be as stiff longitudinally. But my limited experience, no-head to head, is that mainly the Kendo feels a lot stiffer in crud, prolly because its greater surface area, but it doesn't actually flex stiffer. Eg, a much wider ski will tend to iron out perturbations better even at a lower flex. Carvers have different agendas than smoothness.
The rest, I can only suggest that OP read Dawg's reviews, he's good at sorting out handling and feel. I'd be super surprised if the Outland 8.7 or E88 are anywhere as stiff as the Supersonics, for instance, although they'd feel smoother in crud. Yeah, definitely the anti-Kendos in that range.
Would also toss out the Apex/888 here, manages to combine fairly light with fairly smooth with good bite with supple in bumps and soft snow, IME a more versatile frontside that can go off-piste ski for bigger skiers than the other 88's mentioned. Not an A in any sub-category but B+ to A- across the board, prolly a good comparo to the new Brahma for Euro skiers who face ice frequently.