I'm actually a higher handicap using hybrids and a combo set of lower irons (6-LW).

My 6 & 7 irons are muscle-cavs, and the 8,9,PW are muscle back. My GW, SW and LW are proper blades.

I'm considering building some game improvement cavity backs (6-LW) to see if I can offset my directional problems.

But I'll back Kingston - when you find the sweetspot on a blade, there's no better feeling in a golf club.