Just an update here. I was expecting a month or more wait on Bulgarian postage. 11 days later and I have my springs. They made a night and day difference in the "other" product and fit well too. Literally doubled vapor production.
Also ran into a guy working in a vape shop who had an original Heron and authentic Lux, so we got to compare products. Night and day difference. Functionally, almost the same, but in every other way it was like comparing a Yugo to a Ferrari. Perseas, you and your team do beautiful work.
Edit: you wouldn't happen to have Domo Vapor's number would you? I visited the Portland address they had listed on Facebook. It was a real estate broker previously, and is now being turned into a coffee shop...