The best way to manage that peak is using foam tips, if you are comfortable with them. Better option than EQ and since most of us rotate IEMs constantly foamies last more than usual. Generic ball shaped foamies from AliExpress are best for such purposes. SFR is also a wonky brand whose QC is worse than TRN. For cheap IEMs they're worth the risk but I'd refrain from going mid-fi with them.
I agree with you but so far Tape Pros have been polarizing like ZAX. So either their QC is botched up or the tuning is unconventional which for a prospective buyer isn't that encouraging in any way.
I don't know about QC on the sound department, as i had a few SFR earbuds in the past that sounded consistent with each other.. the mmcx connector are hit or miss, though to be fair it was inexpensive, priced around 10 usd.
IEM wise, i have only experienced two: the D.T.6 is good, but i didn't use it often because of the weird tuning of the mid highs (for me), and the MT100 is one of the best and special sounding IEM I have ever heard, and it seems to be a favorite among the few headfi members that have it.
ZZAX has a more unified positive review..maybe you're referring to the ASX/ASF?those two seems to be praised and bashed at the same intensity.
this Tape Pro might also would have polarizing review, but i reckon it would be because of the tuning character.. either we love it or we don't. it's similar enough sound to the old Tape that i don't think QC is a problem. i could certainly be wrong though.
i personally not a fan of the tuning, but i wouldn't say it's bad either. it does certain things in a great way.. provided you like the tuning or can get accustomed to it.