Replying to Should I be using stiffer boots?

Before we start, I know that boot stiffness is very arbitrary and varies between manufacturers!

But anyway, I bought some salomon quest pro 110's a year ago when I was still an intermediate skier. Fast forward and I've gone on 3 trips and have improved A LOT, and I would classify myself as an advanced aggressive skier now, who likes to mainly ski off-piste if possible.

Thing is I'm 6'2" weigh about 103 kg (225lb), but am physically very fit so should I be using a stiffer boot? I mean my 110 salomons feel pretty great but I don't know if my skiing could be a lot better with stiffer boots or not.

Any thoughts or similar experiences with trying different boot flexes?