DocHoliday
500+ Head-Fier
On the subject of tips, I usually find that I prefer the sound of my IEMs when I use a tip where the bore matches the diameter of the inner nozzle, with no part of it being obscured. The sound tends to "breathe" more. The only real exception is with the Whizzer A15 pro where I use the KZ Starline tips. Using wide bore tips on these makes them sound a bit too bright.
This is my usual approach, the only caveat being if the IEM has a lifted mid-bass (VJJB K4). The wide-bore eartips tend to reign the mid-bass in and slightly expand the soundstage.