Been RE'ing my Armormech items and managed to find a third Blue from one of my Greens...
The Green was "Reinforced Mesh Belt" and I found the following Blue schematics:
Critical Reinforced Mesh Belt (+3 Critical Rating) Overkill Reinforced Mesh Belt (+3 Power) Redoubt Reinforced Mesh Belt (+3 Defense Rating)
I had gotten the Overkill and Critical on another recipe and given up trying any further...now I'll have to go back and try that one a few more times to see if I can get the third.
I've gotten Purples from doing the Blue....but I don't know if there's anything beyond that.