Can you give an example of a forearm support?  Not sure what you mean.

I would recommend making an appointment (I say make an appointment because this could take some time, so it would be best to do it when he won't be busy) with your driller to examine your span and pitches.  A few years ago, I was having pain in my elbow, we checked everything, made some pitch changes  and in just a couple months all elbow pain was gone.  

Also, do you use finger grips?  Grips can (not always) cause stress on the muscles and tendons in your forearm.
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Years ago i used a support called the Scala splint
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