I have the schematics for Advanced Magenta Indestructible Schematic (+41 End) and Advanced Magenta Resistance Crystal (+16 End) and both require the Pristine Adegan Crystal made from the Rough Magenta Crystal Shard found on Alderaan. The place I go for the shards is at coordinates (1184,277) which is on top of a large rock which can be hard to get to at first but once you have worked it out its not hard. Something to remember is that it takes ages for it to respawn but you can just go to the second instance and it will be there to. What I havent worked out yet is are you able to carry more than one at a time? The +41 End crystal requires two and I dont want to have to go to Alderaan and back to korriban each time for only one.
Ive seen the Advanced Magenta Resistance Crystal Schematic drop on Trapjaw twice but I ended up buying it off the GTN for 80000C. As for the Advanced Magenta Indestructible Schematic, I was lucky enough to have it given to me by a Guild member, but Im pretty sure it drops off the Primal Destroyer.