Dear Forrest,
great looking IEM for sure.And I am sure it will be a success. I understand your dilemma - few people buy the middle product. A lot of brands have this issue. Let's say you have 3 products 149, 549, 899 the middle one usually is the slowest selling. People love the entry level and the top of the line but the middle models sell below expectations. Why? Don't know for sure, but the assumption is that most people who are ready to spend 600 on something are more willing to stretch out to spend 300 more to get the top of the line, than the "second" best. If you are already in these price regions....
Example: in my region, the hifiman HE400i and 400s are selling well, as is the HE-1000 - the one in the middle HE560 - not so much. Same with Westone (W60 and UMPro50 selling well as do the entry level but W30/W40 not so much`) and Shure (846 selling well, entry level selling well, in between pretty ho-hum).
But that of course is just the Middle East and things might be different to other markets.
I am sad to learn that the FLC8S seems to be a considered an "in the middle" product in China and hence doesn't sell as well as you would like. Maybe you should think about creating a successor of the FLC8S for the Chinese market with more upmarket materials, different cable and whatnot to "justify" a price increase and hence different "status"?
Anyhow, I am crossing fingers the Celeste will be a success, it looks very cool and as mechanical watch enthusiast, I love to see gears moving
One more tip: more choice is not always good. 108 possibilities - I know a lot of people who would be dead scared to have something with so many options. Not everybody will love this abundance of tuning options. Though the FLC8S fans like me are are surely excited.