Sergey, I'm in the same boat as you - had my new e5c's for some 3 weeks, but am struggling to find a tip/fit which manages to combine optimum sound with acceptable comfort.
For what it is worth my observations so far are not dissimilar to yours:
(Apologies in advance for this overly long debut post
)
1. Most comfortable for extended listening (ie.1 hour +) :
Mid-size grey tips (v comfortable),
Clear tips (comfortable)
Foamies (comfortable)
Tri-flanges (not ideal)
Unfortunately after 3 weeks of fit adjustments and acclimatisation, the tri-flanges still consistently give me a low-level head/earache after half an hour or so (when properly inserted sufficiently deeply to give the full sound and sweet midrange for which the Shures are renowned). It is slight discomfort, not pain, but it is distracting and it is a relief to remove them. Due, I guess, to my particular ear-canal physiology (smaller than average maybe?), but that’s not much consolation.
2. Best sounding:
Tri-flanges (albeit stem trimmed slightly to reduce external protrusion), when fit properly. IMO they have the most open, balanced, and full sound by quite some margin over the other tips. I’m very happy with the sound from them (For the moment
).
In comparison the other tips seem to me to have an artificially "thin" sound. To me, as many before me have also observed, the full sonic abilities of the e5c's are unleashed only by the tri-flanges (better even than custom-fits for the Shures, according to some reviews here). I speculate that it is something to do with deeper insertion + better surface contact with the inner ear.
3. Best comfort/sound compromise tip:
Err, there's the problem. I spent some serious dosh (£250 here) assuming, like you no doubt, that this would be sufficient to pretty much say au revoir to both sound and comfort compromises. I’m seeking a fit that achieves the sonic potential of the e5c’s (which as I say is at a level I’m happy with via the tri-flanges) but is comfortable enough for me to leave in for hours on end at work/on the train and forget all about.
From my experiences thus far and from what I’ve read in this forum I’m wondering if perhaps only custom-fit IEM's can truly achieve this, for me. My already-depleted wallet hopes not.
4. Possible ray of hope:
The Westone “Comply Canal Tips” for the UM2 which I understand fit the Shures also. It is a long shot, but perhaps the greater length & more sustained surface-contact area of these longer foam tips will get close to the tri-flanges sonically, whilst being acceptably comfortable also. I’m ordering some today, and will post my results if anyone is interested, when they finally arrive from the States.