If you were to get a different pipe get PC's.
No one is doubting that the guys at Dynojet told you that, we just know it isnt true. You are going to have to rejet weather it be from pipes, temperature change, altitude, fuel quality, etc. Its just something that your going to have to learn if you want to own a 2 stroke. Anyway I really hope you are happy with the pipe,it sucks spending a bunch of money on something you dont like.