the TCR is tight AF

i haven't ****** with it but the Type R option isn't for tightness, its to be able to release it quickly with a hex screw

Below is what I found that the R option is suppose to be for. Is that what the set screw on the side does?

R-Type
This indicates a racing model option.
This option includes a specific black base and a lockable cap applied to the standard F or N1 mirror to secure the mirrors under intense vibration.

i mean dont get me wrong, the mirrors are tight as heeeelll

but my vendor said the quick release feature is why Type R exists

Sounds like you get the best of both worlds with the Type R option. I got mine from RHD Japan.