stem length

hi all I have a canondale cadd 8. 61 frame the stem length is 110mm just of late I have had alot of shoulder neck pain would a shorter stem help I do seem to be over stretching a bit when on the hoods to reach the brakes and that is where I spend most of my time when riding any help please thank you
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3T ARX Pro +/- 17'. It will be pan flat one way and a good rise the other.
Big changes don't sound right from what you've worded.
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