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In theory, there should be a little improvement in heat retention with a WAI. Your WAI uses heat that was going to go to waste out the tailpipe, so there's no way it could hurt warm-up times.
Bear in mind that a 1.5L engine ingests about 750g of air per minute at 1000RPM. You probably ingested some 15lbs of air during the test, and it was an average of only 30°F warmer. If your coolant system + engine weighs 225lbs, in theory, it should be two degrees warmer at the end of your test with the WAI than without.
With a hot air intake, such as one that reaches 120°F in ten minutes, and 2000 RPM instead of 1000RPM, you should see +8°F to coolant temps in ten minutes.
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