Sandwedge

hi - just curious what you all think. I swing between 90 and 95 mph -I was tested at the store and the guy said I need to use a stiff flex. I now have a burner with a stiff flex. the reg flex burner I used to have would slice no matter what i did. I didnt slice my old driver previous to that.
do you all think 90-95 mph swing speed is ok for a stiff flex? what if i get tired at the end of a round and swing at 88 mph will it matter that much with a stiff flex??
SW

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In my bag:
Taylormade R-7 460 driver w/NVS shaft
Taylormade Burner 3 wood
TaylorMade 2007 R-7 Irons 3-PW
Titleist 52 and 56 Vokey wedges
Odyssey White hot tour Putter

WVHS Golf 10

go stiff, i have a reg flex driver with about a 95 swing speed. When I try and muscle a few extra yards, my swing speeds climbs to ~102 and I lose the ball right. U can always grow into a stiff shaft too

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I'm going to be a sophomore in highschool as of September 1.

Lowest round - 74

Handicap - 8

TaylorMade r7 460 - 10.5 Reg
Taylormade V steel fairways - 3 & 5 Stiff
PING Rapture Irons - 4 thru Utility Stiff
Nike Sv Tour 56 SW
Odyssey White Hot XG Blade Putter

Looking for a 3 iron hybrid