swing fault or shaft fault?

[moonducks]

hey all,

im currently playing a cavity back set of irons in regular flex...however my swing speed is around 110 and carry the 9i about 150 yards.

im playing extra stiffs in my woods and can hit it long and straight but my long irons are going right.

even if i try to grip the iron closed or even when i don't swing out to in and swing in to out-staring the ball right of target...its still curves right.

would this be a problem with my swing or is the shaft flex too soft for me

any thoughts or tips?

[Hammer 4]

You may wanna take a look at this.

http://thesandtrap.com/t/76118/shaft-flex-doesnt-matter-mark-crossfield

[vangator]

Dump those reg flex irons. I don't recommend x-flex irons though. Really feel terrible for me.