Too Hot

Hello,
I’m looking for input, please. I have a 408/stroker, nothing crazy internally but enough to make good power. I have been using a 4-row round top radiator built for me by Glen Ray Radiators. The car always ran just below 180 on the AutoMeter mechanical gauge until the top tank developed a tiny pinhole leak. I sent the radiator back to Glen Ray, he did the repair and mailed it back to me.
Since then it runs hotter than before, it struggles to stay below 190, even in 60-degree temperatures. Driving at 55MPH (2,500 RPM) for 15-minutes it will climb to a little over 200. I was using a standard 180-degree thermostat, Hayden clutch with factory Mopar 5-blade clutch fan, and high output Miloden water pump.

After trying to diagnose the issue I replaced the cap, because it had a torn seal, with a made in the USA repop 16-psi cap, no difference in temperatures. I replaced the 180-thermostat with a high flow 180 after determining it didn’t open fully, no difference. I tested the Hayden clutch unit and it didn’t seem to be working correctly so I put on another, no difference. I replaced the cheapest and easiest first, one at a time as I didn’t see improvement. I didn’t make all of those changes in a short time span, but over a year-long period but my efforts were nothing but a shotgun blast at attempting to solve the problem by throwing parts at it. As I replaced those parts I kept telling myself, “it ran cool with this before so I can’t believe it’s the problem.” I didn’t listen to my own thoughts.
I cannot believe, or understand how, Glen Ray would have inadvertently done something that would cause the high temperatures and the coolant is definitely flowing through the radiator so I don’t think it is blocked. The bottom radiator hose is hot but not as hot as the top hose and the coolant level is good. Should the bottom rad hose be noticeably cooler than the top hose? The heater blows very hot air and the thermostat housing has a temperature close to the temp gauge so I’m sure the gauge reads correct.
Any ideas of what I should try next? Any help is appreciated, thank you.