well first off the fit. I've read about the performance series sticking out and not sitting flush as the insertion depth seems to be overly extended. I guess for those with very deep canals this is ok, but I don't think I do. I can only get the tip of my pinky (almost to the first knuckle) into the canal. Others have commented about how they need constant adjustment as the seal breaks with such a long nozzle moving around.
second would be the signature. I'm pretty sensitive to lower treble (sibilance region). 4.5-8K usually have to be attenuated a tad by EQ or I need to use the foamies. How do you find the treble on them? Are they more like a studio monitor accurate, or are they more "sweet" and non-fatiguing?
third is the noise floor. I'm using an x5iii by fiio and am concerned about hiss - not like these are 12 ohms like andromeda, but still pretty sensitive and under 32 ohms. Remember, that only is at 1K - the resistance changes over the FR. So want to know about your experience with "hiss" and these.
I'll address your questions referencing the other IEMs in the price range that I compared with during my consideration:
Noble Django, Unique Melody Miracle v2, Campfire Andromeda.
Fit: yes no getting around it - these do no flush with your ears, unlike the Andromeda or Miracle. They are not at Triple-fi level of sticking out but they will do so. I have shallow canals too so I understand your concerns. I get around these by using Complys comforts or Acoustunes AE07 tips. Both work well for me and the IEMs don't pop out. Still i find them better than the Andromeda's shallow insertions which always too me feel like they want to pop out.
Noise floor: It has ZERO hiss with my AK70, but with the FiiO X7ii there is a very slight perceptible hiss. I can hear this when I am wearing the JHs then plug them into the X7ii. It's hardly audible in normal use so I would say this is the least of your issues.
Signature: I'll try my best to describe my experiences, but I am not a professional reviewer and I can't identify the 4-8k range reliably. Feel free to ask for clarification though.
In terms of treble JH13v2 pro sits between the Andromeda and the Django, and close to the Miracle V2. I found the Andromeda more fatiguing; even after 5 mins of listening I could tell I would be fatigued by the Andromeda. The Django is more agressive, with a smaller soundstage and far more mids; i liked this the least of the 4 despite it being the most comfortable fit wise.
The UM Miracle and JH were pretty close, with the UM miracle having a more slight V-shape, with better, punchier and tighter bass, but the JH having more clarity in the mids. The JH is overall more 'neutral' compared to the Miracle. I did find the Miracle more comfortable fit wise though, even though it was honestly the ugliest of the four.
In the end the tiebreaker between the two for me was stock - the UM was on pre-order while JH had ready stock.
As with all things audio, I would highly recommend you taking a listen to it when you can! Sounds like fit wise it might be an issue for you and these things can only be sussed out with the actual piece in your hands.