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Tim, you may be leaving too much mud on the first coat, causing the 3 1/2 to leave an edge on the second pass. Try running them in reverse, the 3 1/2 on the first coat and the 3 on the second coat to see if that fixes the hard edge prob. If it does, than all you need to do is thin your mud a little more on the first pass to leave a flatter bed. If it doesn't you may have the edges of your blades a little too high; jutting out over the skids.
I use a 3 1/2 on the first pass and a 2 on the second pass. If you use the smaller head on the second pass, you use less mud=less effort, and you eliminate the trash pick-up problem.
Anyway, good luck
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