I dont think you so much as feel heat soak, its more a log of the ODBII (diag) will show it up somewhere in lower numbers, but I have no idea where. Tere might be able to help with that kind of thing, she has a lot of experience in tuning Zeds.
You will probably just prefer one to the other. From what I have read the differences between stock air box, CAI and short ram are very few and far between. Its mainly about noise I guess. Short ram will give more noise as the end of the filter isnt enclosed. Also there have been people with CAI that have driven into large puddles and hydrolocked the engine where water has been sucked up through the CAI into the engine (think thats what it is).
At the end of the day, it all appears to be about personal preference to what you like the best as the self leveling ECU will take control and negate any gains you would see