Are there recipes to craft power crystals that increase the Power stat? The only recipes available from the crew skills trainer are +crit and +endurance crystals, and that's all I ever see on the market, but according to the torhead database there are "sharp" crystals and "proficient" crystals that increase the Power stat. Any clue how to get these?

Nobody knows, eh? Hmm...very well then.

There are top tier sabers that have yellow and orange with END/Crit + Power stats on them, so I would say there are more stats for crystals available... IF you can find the plans to make them from drops/missions.

Yeah I have a saber with a "sharp crystal" in it that does +9 power, but I want to make more like that...where can I get the recipes from? Which one of the crew skills is likely to drop artifice recipes?

mission drops. Rare but they are around. Try searching for crystal under artifice schemetics, there are usually a few for sale in the gtn on my server.

Somewhere I read that +power crystal schems come from Investigation. I've been running a lot of treasure hunting missions and haven't come across one, so it's very possible they drop from crits on other mission skills. Why it would work like that when TH is so integral to Artifice I have no idea.

I just got a schematic for Red Sharp Crystal from an investigation mission (and sent it to one of my legacy who does artifice). It creates a lvl 15 +6 power crystal (blue rarity) and takes 2 Lost Artifact, 4 Red Igneous, 2 Fibrous Nylite, and 2 Marlite to create each.

I got a blue vehemence crystal schematic (level 31, +14 power) in a lock box from a treasure hunting mission.