AR Lipil Formula?

Hi everyone…We saw our specialist today, and he is having us try the AR LIPIL Enfamil formula that is made with starch. Our son does not spit up, but he is having a terrible time with the rice we add to Alimentum. We are trying to see if he is truly having a hard time after the bottle because of the rice, or if it is strictly the reflux. So, here we go again on another trial… I was just wondering if anyone had thoughts about this formula compared to thickening with rice, etc. Also, I have heard to mix the formula with cold water, then heat it up. I never knew this was a way to make the bottle…I always started with warm water. Thanks for listening.