[undy]

El,

Do me a favor, get a volt meter and read your puller fan voltage at the fan relay outlet or fan motor (better) with the engine up to temp, at idle with the usual accessories on. Take a new reading with the headlights on too. Let me know what you find.

The highest CFM puller fan will pull like poop if it's run in an extreme under-voltage condition. The "typical" replica wiring harness is marginal at best for hi-amp fans (inadequate conductor sizes). Also, a lot of alternators struggle to put out 10 to 15 amps at idle.

I think you'll end up discovering the only way you're going to improve things is raising the air CFM across the "full face" of the radiator at idle. Your "tight to the radiator" shroud isn't helping things either.

Dave