I have had a similar experience. 55 with some past elbow issues. Based on my moderate swing speed, I tried to transition to 75 gram graphite. Tried MMT 75R then Steelfiber 75R. Had trouble finding the middle of the face with that weight so switched to Modus 105R in new irons. Much better results so far. I know I will eventually have to go back to graphite. Problem is that anything around 100 grams or so is very stiff in graphite. Anyone try to softstep heavier graphite to make it play more like comparable weight steel? Or the softer FC Steelfibers?