[dontlifttoshift]

Lots of questions.

Pulley ratios before and after the AC/serpentine belt install? It obviously worked before, did it change?

How far is your condenser from your radiator? Too far away and the air gets turbulent between the two.

Why the dual 1.5" tubes in the new radiator? You added an inch to the core and then another 3/4" with the condenser. Late model radiators are thin on purpose, it is easier to push air through. It takes a lot of fan to draw through all that.

Where is the fan probe at? If on the bottom of the tank like the instructions say, move it to the top and get the fan running earlier.

At warm idle, what is the temperature differential between the top and bottom hoses?

Confirm gauge readings. Seriously, step one, confirm that your gauge is accurate. Everyone think theirs are spot on, but most aren't.