Another cheap option I forgot to share and given that you did your CC not long ago is to use CRC’s Intake Cleaner. A few of us are testing this and have added this to our maintenance regime (every 5K miles). If the cause is a bit of carbon in the flaps making it get stuck or not opening within range, this could help (I can’t assure it but worth a try) to clean up some of the build that you might already have.
As I mentioned it’s not that expensive and easy to do:
https://www.amazon.com/dp/B00PHNQKR2..._bjKNDbRMF8RV5
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