titan universal has been selling in china by jaben a few years ago. not sure if they're still offering this model now. i also got a 2nd hand unit a few years agoAccording to the FitEar Homepage, there is no TITAN Universal as you see here
https://fitear.jp/music/product/universal.html
I checked older Versions of the Homepage with the Wayback Machine and the "Products no longer sold" Page, but there is no Mention of an TITAN Universal anywhere. e-earphone and Fujiya-Avic also never heard of an TITAN Universal. This product seems to not exist as far as i can tell.
I found one on Jaben but that one is just the TITAN Custom Demo Unit (Is Jaben selling the Demo Units as Universal?)
Anyway, if that is the case (i can only guess, as there is no official information from FitEar), then the first thing you should try is COMPLY TZ-500. If that doesn't help, a lot of power usually means (not always) high output impedance and high distortion at very low volume (What you will use when the device has a lot of power)
If that influences the tuning of the IEM and how depends on the impedance of the IEM. Some IEM get a bass boost, others get a treble boost but there are IEM with linear impedance where just nothing changes (That is when people call it "Not picky" or something like that, like if the IEM has a mind on its own^^)
So the first thing you should try are the COMPLY Earpieces and then, with a device that is the exact opposite, not a lot of power. With 3.5mm to keep the output impedance as low as possible to see if it might be due to high output impedance.
i found some old photos i took back then, alongside silver and EST Ti. subsequently i got the ciem titan too, i didn't found significant difference in sound between the two versions even the shells are in entirely different shape except for better fit. the universal is quite a bit smaller in size.