I'm just using the stock bi-flanges right now. They penetrate deeper somehow on the v2s. That's what she said, right? I've played around with a few other tips (olives, complys) but the bi-flanges really do the trick. I'd be interested in trying some TRI-flanges for even more penetration, as my ear canals are rather whoreish. On a side note, I listen to all genres of music on the sm3s, even kidzbop, and they perform magnificently across the musical spectrum, but where they really, REALLY shine is electronica. You wanna give your sm3s (and your eardrums) a workout? Listen to Vessel by Jon Hopkins. Holy mother of god that sounds good.
Don't care for stock bi-flanges -- they are too stiff. And the stock (gray Complys) are too long (tho better sealing and very comfortable). Best universal tip are older yellow foam for Shure.
Partly disagree about your comment that SM3s "perform magnificently across the musical spectrum, but where they really, REALLY shine is electronica." [You may have not heard other some IEMs that perform better] Not sure which type of 'electronica' you mean but the SM3v2 (for me anyway) fall apart (becomes congested) with complex, fast-beat electronica. (If you like the slower, drug-trance 'electronica', the SM3s work better).
SM3 is for you ... If the type of music you listen to is not ... fast-beat, pace-rhythm dependent (big-band Buddy Rich-style; disco), and/or complex-large-scale dynamic (Mahler, Beethoven symphony )... but you instead like slower jazz, chamber, slow trance, minimalist (space music, Philip Glass, Steve Roach).
Since most music passages -- regardless of styles/genres noted above except disco/dance -- are non-complex, SM3s overtly have a false sense of appeal due to their euphonic midrange. The SM3s get congested when the music signal becomes dynamic and/or complex, requiring fast transient response. E.g. orchestral crashes and 'shocks'. I noted that SM3s are ok when pace and rhythm are not important. But, as I noted elsewhen, pace and rhythm are always with us (even slow tracks have to move right along). These, IMO, are very important music attributes that our gear has to reproduce; unfortunately, pace/rhythm often neglected in reviews and product literature. The lack of very successfully addressing these attributes is why I find SM3s uninteresting.
One thing I've noticed (and this may have been pointed out by others) ... the SM3s perform better at higher volume. But listening at these levels are uncomfortable after a few minutes (headaches, earaches, etc.). So not a very useful "quality" especially since their isolation is pretty good IAC.