Small block radiator size/cooling issues

i had cooling issues with my 408 stroker motor. At first i had a 2 core 22x19x3 radiator from summit and a 5 blade clutch fan. I had regular coolant in the radiator and my temps stayed at 230 cruising and would climb farther if i was stopped. I switch coolant to 40% shell glycol coolant (its expensive but we use it in the ferraris and help greatly) 60% distilled water and a bottle of water wetter. the temps then stayed at 210 cruising and would climb to 230 if i was stopped.

Well after being fed up with my engine running hot (grant you the weather is about 110 out here mostly) i switched to a griffin 26x19x3 radiator and a derale twin 12" electric fan setup. Now my engine will stay cool at 195 cruising and will climb to maybe 205 if im stopped. i rarely need to engage the second cooling fan but when i do it brings the temps down quickly.

I would first try different coolant because that is the easiest thing to change.