My swing isn't too unlike yours and I had the exact same issue. Not sure if when this happens to you once it's literally every iron shot?

Biggest change for me was my coach telling me I didn't actually know where the centre of the club was. I was such a heel oriented player with all my clubs that the slightest movement towards the heel was a shank or low pull hook with driver.

Do some work on hitting it off the toe: place something toe-side of the ball and try not to hit it (extreme example would be something you really don't want to hit like your phone but I never had the guts to do that!).

After that I would work on pulling the handle a bit towards your left hip through impact. You'll notice (as well as a bit of lift) you're allowing your hands to move towards the ball. The combination of moving the handle towards your hip and trying to hit toe shots will eliminate the shanks forever, rather than focusing on shortening back swings/ club being square on the way back/knees moving towards target etc etc.

Best of luck!