What ball flight do you have with your irons? I never slice with my irons. If I slice, it's a shank, and if I shanked my shot, it's because I got lazy with my swing. I feel when it happens, and it pisses me off to no end. If I'm making perfect contact with my irons, my ball flight is a slight draw. On miss hits, I end up off target left. If I am missing left, I correct my aim right, and every so often I make perfect contact when doing that and carry right (but not a slice). I cannot tell you the last time I hit a slice with an iron.
All of that has to do with the time I spent working on ridding my driver of the slice that kept me from using it for so long. I could be wrong, but I've always understood the main contributor to why some people draw and why some people slice - is their swing path. I know some of it has to do with club face angle at impact, but generally an out to in swing path will create a slice, and an in to out swing path will create a draw. There are certain foot alignments you can use to play a draw, a hook, a cut, a fade, but if your feet are square and you are swinging at the ball and constantly slice - it likely has a lot to do with how you are bringing the club through the ball. What I practiced was to keep my left arm straight, and tuck my right arm against my body, almost like if you envision trying to hold something between your arm and the side of your body. This helps me exaggerate a good shoulder and hip turn, and then as I bring the club head through the ball, it almost ensures that I am drawing an arrow that looks like it curves from left and straightens out.
With the off season, I lost a lot of my driving consistency. Coupled with trying out a couple different clubs, I kind of fell off a little bit. My 905R ended up back in the bag and I was hitting it really well, but the VR Tour bug bit and I decided to give that a try. I did not have a single bad miss with that club, but I also wasn't even coming close to drawing the ball. I had one absolute bomb that was just dead nut straight but otherwise all of the flights were fading. Maybe I can attribute it to the open face, the longer shaft, ball position, I'm not sure. As long I can repeat the same ball flight consistently, that's all that matters to me.
My steel shafted 983k is a draw machine, but that's because of the heel weighting. I just got my graphite 983k regripped, so I'll probably play with that for a little bit tomorrow if the rain stays away.