After playing around with the set bonuses related to the Persistence vanity set, I thought I would share my discoveries.
Two Piece Set (any 2 piece combo [56&66, 56&61, 61&66])
Bonus: 50 Health, 10 Armor, 5 Dodge
Three Piece Set
Bonus: 55 Health, 15 Armor, 5 Dodge, 1 Crit
So this should bring balance for anyone who doesn't have all 3 pieces, but does have atleast 2. Because with 2 you get the majority of the possible bonus, with only a slight improvement for having all 3.
As a side-note:
A possibly superior combination...
Founder Helm + Persistence Shield + Persistence Armor = 50 Health, 15 Armor, 5 Dodge, 5 Damage.