Similac Total Comfort

My little one will be 6 months on Nov 14th. He was diagnosed with reflux around 2.5 months old and since then we have tried different formulas to figure out what works best for him but still seem to be struggling. He is on Zantac twice a day for the reflux. He spits up a lot and seems to be in pain after eating (mainly worse in the afternoon and evening) We started out on the Kirkland (Costco) version of Similac pro advanced. Then tried Enfamil AR (made him very constipated), tried Enfamil Gentlease (made him spit up the worst), went back to Kirkland, then to regular Similac Pro Advance and now we are on Similac Total Comfort. He’s been on it for 4 days now and yesterday he spit up a TON (we were off schedule however bc we had a shower and birthday party). Today has been less spit up than yesterday but he seems to be having trouble getting comfortable today and we have also noticed the past two days he seems more hungry. He normally eats 5oz every 3 hours and now seems hungry after 1.5 hours. He started solids already as the dr said it would help his reflux. He gets solids 1-2 times a day. Anyone have any experience with Total Comfort? I’m ready to throw in the towel and go back to regular pro advance! (Note: we changed to Total Comfort bc after his 12:00 & 3:00 bottles he cried a lot and nothing seemed to calm him which made us feel like he was in pain) thank you!