Are you still using the same irons as pre-stroke?
My own story, I had open-heart surgery in 2005. I was recommended for surgery after a stress test - I did not have a heart attack. But, I lost an inch of muscle from each calf, and had extra work to get my torso back into good shape.
Anyway, an interaction of the surgery, plus the fact I was 55 at the time, spelled the end of stiff shafts for me. I fought it for a couple of years, and then switched to Regular.
In my pre-surgery irons, I had 125-gram Dynalite Gold stiff shafts (high-launch cousins of Dynamic Gold). I started losing distance.
Initially, I got X20 irons with Uniflex (between R and S) shafts, about 110 grams. Then, I got bold and got some X20 Tour irons with Project X 5.0 Rifle Flighted shafts (115 grams, with stiff tip). On some days when I play, they feel harsh. And, I'm getting a lot of distance variation.
Anyway, after several tests and trials, I am getting my Tours reshafted with NS Pro 8950GH R.flex (about 20 grams lighter and a softer R.flex than the PX.
Sorry to ramble, back to your original question. Shorter irons are easier to hit because they have shorter shafts. I have my distance fall-off starting about the 7 iron. IF you still have your pre-stroke irons, you might need lighter shafts. This would allow a more even power transfer as you go up and down your iron set. Anyway, if you haven't been fitted in awhile, this would be a good time to do it.
Most of all, I'm thankful you survived your stroke. I've had a couple of friends who had strokes, and my heart sank when I watched how much work it took them to recover. Hang in there, and I'm glad you can still play golf! Let us know how things go.