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Does JROK put out composite sync, pos or neg? I believe it's neg. Check monitor schematic and pinout. I agree the 3pin might be wired wrong.
http://www.arcade-museum.com/manuals-monitors/Wells%20Gardner%2019k4901%2019k4906%2019k4951%2019k4956.pdf
Your set for standard resolution where it is at.
Leave the sync connection where it is and try adjusting the horizontal hold. Follow this link http://antelopearcade.com/files/Monitor Manuals/Wells Gardner 19k4901 19k4906 19k4951 19k4956.pdf for the location of the horizontal hold pot. There is a picture of the location on page 3. Need to do the adjustment with the game and monitor on to get the right picture.