My Problem with Mike Austin Golf Method?

Okay, the other day i decided to give the mike austin method a try. And I must say, it was the best switch i have done in a long time. since, i played baseball at 5 until i was 13-14, throwing the club, comes naturally. there's only one problem. when i hit with my irons, i sometimes hit it great, but more times, i SHANK. Idon'tt need to switch my mechanics, if there are any Mike Austin Users or golfers who throw the club to help me out. Thanks