The Tsx Comply series tips are excellent. Pricey but shorter than normal foam tips and hold the H200 in better than anything else.
Edit: Never experienced any damping though with the H200, MTPC and Stage diver 3 which is good as they shouldn`t alter the sound to that degree.
Good to know that you also like the tsx series. In my experience they have significantly reduced the harshness in the sss's. can you do an A/B comparison between them and the stock tips on this song: http://youtu.be/fAcPySZXA1M
That is one of my main test track for sibilance because it's a subtle song and makes every change really noticeable.