Funny is how Tyll's plots look quite like I described the IEMs in the lows and mids (Titan 3's red line) (except for the treble which I hear as being more present when listening to noise signals and sine sweeps).
Imho proves that ear anatomy and the amount of how close the vent sits to the concha are even more important for the perception of the Titan series (which have more correct mids in my ears than the DN-2000J by the way).
In my measurement coupler without any artificial ear, the plots did not match my perception and looked way different. Simulating an artificial ear by placing tape close to the vent then showed about the same results as on Tyll's plots and the mids were correct in contrast to when I did get a good seal but fit wasn't perfect yet.
I think Tyll is probably putting the Titan's all the way to the reference plane, which is impossible in real live usage without triple flange tips. Normal wear position is at least 6mm away from the reference plane, which is going to make treble peaks higher in amplitude and lower on the frequency response scale. If you do try trips on the Titan 1, it will tame the treble a lot but then, IMO, defeats the purpose of the wear design of shallow and comfortable