Yep those will help to tame the treble
Some folks also use a knowles filter (if you are adventerous).
The knowles filters can be bought on aliexpress or amazon, just search "knowles filter" or "knowles damper". Do buy a damper removal tool too for easier removal of the filter.
The knowles filter doesn't just tame the treble, it also increases the soundstage a bit IMHO. I bought mine here: https://www.aliexpress.com/item/32580267018.html but you can just buy it from the cheapest shop or something.
This is not an Audiosense T800, but putting in and removing the knowles filter is done similarly.
The knowles stock damper inside the T800 shell is white, and so u can add another knowles filter into the nozzle (I have tried the brown or green or white or grey), and if you do this, it is additive in damping (add the stock white damper's 680 ohms + whatever damper u put into the nozzle).
Others are more adventurous and removed the stock white damper within the T800's shell and put their aftermarket damper inside the IEM (I haven't tried this personally, afraid of accidentally damaging something).
Or, if you don't feel like messing with that, you can use these, which I got when first I got the T800. Also, these respond more to cable rolling and tip rolling that I have experienced in many other IEMs.