Wow! I just did this after reading your post, and it's completely transformed my set. The dull midrange is gone, and now the sound is very "alive". Thanks for sharing your finding.I have posted this message in the discovery thread as well but reproduce it here:
Some may have seen my thoughts on the GK10. I was ambivalent about them. I have just stuck a pin into the vent beside the connector and at first it would not go in. I forced it in and now the vents are clear. The transformation in the sound was very noticeable. There is far more life in the sound now and the high frequencies are clear. If you are disappointed with the GK10 I urge you to try this, it certainly worked for me and now I am beginning to appreciate the potential of this IEM.
Now it's time for me to get to know the real Geek.