Man, Joohunta, thanks for ur post! totally agree
forgot to say this too! I listened a lot the TF10 before buy my SE535 (actually it was my first option due to the price, but for me, as I walk a lot with my IEM, the fit are important, therefore I bought the shure) and I should say that I had the same impression! the 3SL is a cheap TF10! they have exactly the same equalization!
now about the fit, try to buy a Comply foam, I just bought mine, the T200 fits perfectly and its way more comfortable than the stock one