I don't see any corrections noted for the crown pattern so it may be that you're inadvertantly skipping one of the increases (especially if the math for the increases works out on paper). See if you can spot the missing increase and correct it or else, add in an extra increase to get yourself to 30. I don't think it will be so noticable on the crown and who's going to count anyway? Here's a link
to the Rav page with pictures.