If you like the feel of steel and want to stay with it, Nippon came out last year with the N.S. Pro Zelos shafts, specifically designed for slower swing speeds to produce higher trajectories. It is also the lightest steel iron shaft available at 73 grams in the R2 (A) flex. It comes in both .355 and .370. If you are considering graphite, we have had a lot of success with the Xcaliber iron, which does come in a L/A combination flex in the .370 tip, the Xcaliber Tour SL irons in an A flex that is 62 grams. A new shaft this year that we really like is the Paderson Kinitexx TS-I Trajectory Series Irons. 73-75 grams, comes in A flex in both the .355 and .370. It is a high trajectory shaft in the A flex. We worked with the designers to create this line that is trajectory specific for each flex. In other words, each flex is weight and flex matched to optimize trajectory and performance. Feedback has been great for this shaft.
Hope this helps.