I have a feeling that the rice pablum will slowly make a difference. Sometimes that little bit of more solid can give them a satisfied feeling. I think you are on the right track. I know you must be exhausted by now but you could be very close to the solution to the crying. It may take some feedings with it for it to get him established and more comfortable but that even worked with my sick child. I was frantic and no one could offer a solution to her crying. It was thought to be colic. Her “colic” stopped when her tummy had something solid to fill it. Hoping!