The PvP ones come from the PvP crafting boxes. As far as I'm concerned, the +41 cyan/+41 purple PvE schematics do not exist in the game currently. There hasn't been any proof, at least. BioWare told us they'd be craftable but that was simply a lie
I feel you.... I've been looking for it just as hard as you have. No luck still =/. I want a +41 power but a +41 crit is fine too... even the +41 end at this point