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GREAT, great article. The originial thread on DOV is what got me interested in pitching mechanics in the first place.
I'd agree with #6 and just stop overusing the fastball in general.
I'm no expert (I've only studied a little A&P), but the pronator teres isn't going you stop you from pitching unless you really overdo it. Just work it out, and lay back when its sore. It seems like a logical solution.