Might be a little late, but
We removed the doors from our Savannah VG with a 912ULS and my wifes mike was almost unusable. (older David Clark headset) A little black electrical tape covering the back side opening under the sock helped, partial cover on the talk side fixed the wind noise problem with very little attenuation for the intercom. We put the doors back on and have flown several times since. This was the first time I had thought about it still being covered as her conversation are normal. We still have a little fuzz on climb out at times in the intercom, but once up to speed it works well. The tape seems to attenuate the microphone but it is still very usable. Give it a try, peal it off if it does not work. It seems every headset has different frequency levels that they are most sensitive to. You might borrow some others to see what works, my headset seems more sensitive to interfirence on full power climb out, but settles down after slightly reduced power for some reason. Good Luck.