I concur. I've attempted the creme on Triggerhappy around 3 times and no joy. Likewise with my "Classic" "reissue" First Aid. I have a junker Triggerhappy I can try using a peroxide solution on, but I'm still kind of annoyed his colour hasn't even budged considering how well it worked on Weirdwolf using the creme.
My brother has also used the creme on Highbrow and he came up spectacular. So Headmasters appear to be fine but Targetmasters, not so.