I think its necessary to define over the top in relation to what plane line. In Bobby Jones case I don't think over the top is exactly accurate. His takeaway/backstroke is way inside, more like a 10-5-E plane line. To come down on that plane he would have to continue with the rotated plane line and swing to right field, with his downstroke pivot motion being parallel to that line. Instead, he allows his left arm to shift out so he could come down on plane in relation to his setup.
Now, I think the problem hackers have with their 'over the top' move is that it is truly over the top. They start down and get above the original plane but try to make their motion in relation to their original plane therefore bending their delivery line. How about if after they made this move they allowed the plane line to shift to the left and made their delivery along this plane line, complete with pivot parallel to that line.
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