The impressions i sent VE for my elysiums is with the bite block. I’m curious what’s the difference if without. I don’t really have any fit issues with my elysiums though.
Hmmm... that's strange, since VE have always worked with closed-mouth impressions. Regardless, from what I've learned, generally-speaking, it doesn't really matter whether it's open- or closed-mouth. Ear impressions, when they're turned into CIEMs, are trimmed and contoured so much anyway, that it overrides whatever differences there are between mouth positions (as @fiascogarcia described). So, it's more so a matter of what the manufacturers are comfortable working with. VE, with their closed-mouth impressions have one of the lowest return rates in the industry, so it's definitely something they've mastered.