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From what I've seen over the years the rocker shafts need to go down not up. When you are opening the valve farther then the midpoint is lower not higher. So the shaft needs to drop into the head in order to get the correct geometry. Lowering the shaft is much more difficult than raising the shaft which is why most people don't bother.

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Since we are discussing moving the shafts, what do you think needs to happen to the shaft location in the attached picture and why? That picture was taken at full lift by the way.

To the original poster, DO NOT GRIND THE ROCKER ARMS! That is not the answer. With a little more information there are way more correct methods for resolving your issue. Get us more details and some pics.