Welcome to the club,
@Tawek
Just FYI, here's a comparison of your two IEMs, measured on 711 couplers:
One confession here - I "borrowed" the EX1000 data in the above graph from
@crinacle, who shoots for 8 kHz resonance peaks with all his headphone measurements, which could give a slightly false impression in the above that the EX1000 rolls off a little sooner than the Xelentos in the treble. Otherwise, there are some similarities in the FRs - except that the EX1000 just doesn't have much in the way of low-frequency punch. I can understand how some would prefer the extra definition you'd get by losing some low end. The Xelentos have a fairly hefty mid-bass and if you take that away, your brain is inevitably able to focus more on what's left behind, i.e., you'll hear more detail in the rest of the spectrum. I think this is a similar story with the Tin P1 - another good headphone, but one that also lacks a bit of sub-bass.
I wanted to ask you what you meant by "faster bass". Speedy bass seems like a bit of an oxymoron, because reproducing low frequencies is the one time where your driver diaphragm definitely isn't moving fast. There's nothing egregious about the decay of the low frequencies on the Xelento:
If you mean fast transients, i.e., rapidly switching from one bass tone to another, that's something that should be more apparent at higher frequencies (guitar pick, piano, snare drum, etc.) or even infinitely higher frequencies, like an impulse. I made some comparison plots of impulse-response for the Xelento in the following review I wrote - second one down on this list:
https://www.head-fi.org/showcase/rha-cl2-planar.23337/reviews?order=rating&direction=asc#reviews
The Xelento's impulse response isn't all that far behind the KSE1500, which is the thinnest, lightest, fastest driver I know of in an IEM. BTW, if you superimpose a bass tone, say a 100 Hz sine wave on that scale, it'll basically look like a flat line, as you're only covering about a fifth of one wavelength on the timescales in those plots. So, ok, the tortoise might end up winning the race, but the reason isn't speed
Maybe you had a flabby bass because of a lack of damping from some very high z-out source, but I somehow doubt that in this day and age. (Out of curiosity, what was/is your source?)
I don't doubt you're hearing differences, but I strongly suspect they're not related to the "speed" of the bass. Can you elaborate on the differences you're hearing and what you meant by "faster bass"?