Ok,once you get to the lvl where you can train for the enhancement 19 and up, some schematics are exact duplicates of another. I dressed up a list of the eEnhancement 22 that were duplicated (probably the same goes for 19 and 21):
Adroit - Wisdom
Assault - Wily
Astute - Intuition
Barrage - Savant
Bastion - Steadfast
Bulwark - Vigilant
Cognizant - Lucid
Erudition - Veracity
Finesse - Volition
Foresight - Verity
Incisive - Severe
Inertial - Ward
Proficient - Studious
Sagacity - Sentient
There is also those 2:
Reflective, +13 End., +19 Crit., +19 Power and +28 Shields
Skirmish: +13 End., +19 Crit and +28 Shields.
I may have missed some, but I really hope BW will do something about that.