Replying to Calling all bootfitters (Not a sizing question)

This has to do with the flex of my boots.  I am 6'4" 195lbs and am riding solly X-Wave 7's which have a 80 flex.  I ride like 80% all mountain 20% park and normally charge pretty hard off piste.  My foot just grew an extra 1/2 size in the three years since i got my boots, so i will be getting some new ones this summer.  I think i want something stiffer, but i don't know how much stiffer should i go? 

How would a 110 flex change my skiing experience versus just staying at a 80-90 flex?

I also ride stiff skis, not noodley park skis.