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I am in a similar boat, only my only WAI change was my upper grill block increasing under-hood temps. I think the ideal temperature will be different from engine to engine. It is very hard to test this, especially since my car’s intake air starts cool and slowly heats up over time as the engine warms all the plastic intake nonsense under my hood. I have noticed I get my best MPG approximately when my warmed intake air temp hovers around the 110 F range. If it gets too warm I am pretty sure my car pulls timing or enriches the A/F ratio. This is all based on my experiences with my gauge driving the same route on different days of different temperatures; take it with several grains of salt.
I have some ideas on making an adjustable WAI by taking a ram air intake and “Y” ing it into a warm air pipe and a cold air pipe. Then run the warm air pipe over near the heat source like your exhaust. Then run the cold air pipe out in front of your radiator, and put a flap on it. By opening or closing the flap you could effectively adjust your intake temperature. Of course you have to include an air filter in there somewhere, and I would also suggest an idiot-proof setting (full cold) that you could leave it on if you had to let someone else borrow the car.
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