[Grade 2 researched compound]

Researched compounds are from investigation, which are required in blue and purple schematics. You do get scavenged compounds from scavenging, but those are different.

[REing Blue -> Purple Rate ?Bugged?]

I am not sure about earpieces, but as far as weapons go for each blue you have 5 different possibilities on the purple. If I have wanted a gun with different stats than the purple I got I just keep RE'ing until I get a different schematic.

 

I just looked at the market and the earpieces appear to follow the same naming convention, ie overkill, fervor, anti-armor, etc. So I would assume that it would work the same and you are just getting very unlucky. You probably need another cybertech to chime in who has been successful though.