You can’t do that, it would be wrong. You can’t just consider 55 or 60 or whatever degrees as heatsoak, there may be scenarios that it is actually the actual temperature.
Scenario 1 : ambient temp 20C, iat temp temp 55C in traffic, lambda goes lean, we can consider it heatsoak.
Scenario 2 : ambient temp 40C, intake temp 55C, it isn’t heatsoak.
You have to differentiate these two scenarios.
So the ambient temp vs intake temp delta is the best way to do it.
And it still it wouldn’t be perfect, because there are people with cheap inefficient China town intercoolers that raise iat from 25 to 55C in an one high gear pull only, which would then be actual. I have seen it many times.
So there is no perfect solution, and that is why closed loop fueling correction exhist, but it won’t get any closer than using the way i mentioned above.
Who knew a simple IAT sensor could cause such much trouble 
Sorry 
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Lol Dont worry i had the same problem with Haltech Platinum. I added 14% fuel for 60celsius intake i think it still needs more xD