For those who have followed the "saga", I have received my Fidelity Duals yesterday ... no need to go postal after all.
However I can't say I'm all that impressed with the sound and I'm afraid (or rather, I really hope) the seal is probably responsible for that. Also they're still burning-in, maybe that'll help too, but overall I find the sound lacking bass and volume, that has to be due to the seal. I did go to an audiologist to get the ear impressions done, and he seemed knowledgeable, and he did follow the instructions Fidelity have on their order form, and it was an open mouth impression, but despite all that the seal on the right side is very loose. Just by gently pulling the cable up I can break the seal on that side ... not good, right? Plus in my opinion they could have made the IEMs go deeper, maybe I should have specified that on the order form, or maybe I'm just used to having my Q-Jays go deep and now these seem a bit shallow.
So I guess I'll go buy some transparent nail polish in the afternoon and try to fix the seal myself (at least temporarily) to see how the sound improves. Any suggestions on which polish works best and how to proceed cautiously, I wouldn't want to ruin the IEMs just yet.