I am aware of that and probably should have worded it different but I still stand by my conclusion the single dynamic driver of the 215's have more bass than the single BA drivers I have had or borrowed.
Unless you plan on keeping custom molds indefinitely since they will only fit your ears correctly I would go with the 846's at least you could sell those to almost anyone should you want to upgrade in the future.
I wish I could compare the IE800 and the SE846 the same day,equipment and music since they seem to be top of their game and although i have heard each at different times they both sound better than any other IEM that I have currently heard.
I wish the mfg.'s could produce either of these below a grand which is IMO hard to swallow for an IEM not so much for full size headphones.
I was fortunate enough to be able to listen to a musician friend's IE800 and that was all it took to get me hooked and he explained that with a single dynamic driver that can cover the 20-20000 Hz spectrum with less distortion than multiple driver BA with crossovers takes some engineering as well as size ,shape and material used in an inclosure so no i would not say its just an overpriced dynamic iem especially after listening to them.
I bet you would be surprised out in the field there are complaints about extra long cables getting snagged and resulting in damage to the cable or equipment maybe they should offer 2 different lengths as some do.