Top of the Tongue
If you use more of the top of the tongue for your tongue blocking you'll find that you can use a lighter touch (tongue is wider the farther you go back = better coverage with less "push") and you'll be able to perform pulls more easily (a pull requires you to cover four to five holes... better coverage makes this technique much easier). With this lighter touch you'll also find your playing to be faster (less drag). Tilting the harmonica (face down... towards your tongue) and placing the harmonica a little bit deeper in the mouth will achieve this.
By the way... I just recorded all of the 1st Position Studies yesterday and will record how to play in Minor today. You should see these lessons start to come up in a couple of weeks. Have a great Monday!