I think (not positive though) it's this, Kanras could tell you exactly what the numbers are:
255 Dex = 2.0 Procs per minute in main hand
127.5 Dex = 1.0 Procs per minute in main hand
255 Dex = 1.0 Procs per minute in off hand
127.5 Dex = 0.5 Procs per minute in off hand
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