I like at least three rows inside the radiator. The more time the coolant had sitting in the radiator the more it cools from one row to the next. One other thing I run a mated Water Pump Housing and Pump. There are a lot of differences between housing and pumps. NHOA did a study at one time and put it in there news letter on all the pumps and housings. I run a 160 high flow quick opening Stat. My set up is completely factory, 26 inch cooper rad, factory E Body completely but I do not run the clutch on the fan just the seven blade fan. I never run anything but a mixture of Anti Freeze and water like Chrysler does. 50/50. The Temp stays around 163 degrees temp taken of the pump. I don't think you want to go to what I have since you have spent money and time on making the cooling look a lot prettier than what I have. I believe you have tried all kinds of thing with the timing it can be a big contributor to a heating problem.