Are stiff graphite shafts not particularly good for slower swing speeds. I have no idea what my swing speed is, but it's definitely on the slow side. Back when I started in April, I bought a second hand set of Titleist DCI OS irons to get started out on. They have Titleist Select Custom Graphite Technology S (stiff) shafts, with the PW actually having an Apache PM-40+ graphite shaft (not sure about the flex, but it feels stiff).
http://www.titleist.com/historical_clubs/details.asp?id=14
I've read that having a shaft that is too stiff for a particular swing speeds will often result in a lower trajectory, shortened distance, and slight (or worse) pushes to the ride than an appropriate flex shaft.
I often feel that my shots iron shots definitely have a lower trajectory than I'd expect, aside from the PW and occasionally my 9. I get high loft on my SW just fine. I often struggle with pushing irons shots a bit, particularly as the irons get longer.
Though, this could always be more due to issues with my swing that need to be worked out. I've had several lessons and have begun to develop a solid swing that just needs practice. Though, my instructor did comment off-hand about how stiff the shafts were ("stiff as a board" to be precise).
Would there be any benefit to looking into some replacement irons with a more flexible shaft? These aren't exactly game improvement irons either. The soles are pretty thin and the cavities shallow (compared to modern game improvement irons). Perhaps a more flexible shaft combined with clubheads with modern game improvement specs would help my iron game? Though, I'm not looking for a band-aid or anything.
Or am I wasting money and just need to spend more time a the range and stick it out with these?
I've been eyeing these:
Callaway Diablo Edge R irons ($300, closer to $230 on eBay)
Used Taylormade Burner 2.0 (~$300 used)
Used Titleist AP1 (~$320)