Hit some balls tonight using the drill mentioned above before each shot. The mid irons were great (7 - 8 irons was approaching from the inside no problems)
However as soon as i went down to the PW or SW i was coming over the top each time.
Anyone got any ideas why I would be more prone to the OTT move with the short irons? (checked i was the right distance away and seemed ok) it was shank city and the tee i placed outside the ball was getting snapped every time....