I guess the addition of the AC condenser reduced air flow enough to cause what you are seeing. Electric fans just aren't going to move the amount of air that a big factory fan will, specially with the factory shrouds designed to work with them.
The factory went to considerable lengths to up the cooling efficiency on AC equipped cars.
You might be able to just add a few baffles or seals to make sure at low speed it's not recirculating under hood air.
If it's running above the thermostat setting it's always a bit scary, that means the cooling system is maxed out under those conditions.
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