Droid Engineer Archive

I am a novice DE, currently plugging away at MSE droids. I am wondering a couple of things.

1) Why is it that under Droid Refinement the description says "to learn additional component schematics" but all the components are listed under blueprints? Seems like a wasted tree to me, unless they keep just droid schematics under blueprints and put all the sub components under Refinement.

2) Which tree should I advance in to get a decent grinding item? MSE's are okay for now, but looking at this entire tree there's an insane amount of XP that is needed.

Well forget about the grinding question, I did some reading and found out that's a dead horse. =]