Corrections on my previous post.
Summoner's Doublet +2 :
Reduces Sp. Blood Pact MP cost =
174 MP (-8) if BP 1/5
145 MP (-37) if BP 5/5 (my Perp Cost was 0, no Auto-Refresh or Blood Boon proc)
Summoner's Bracers +2 :
Inc. Sp. Blood Pact magic burst dmg. =
MAB+8 on MB if BP 1/5
MAB+40 on MB if BP 5/5 (same as wearing Nirvana 90/Eidolon Pendant/Tiresia's Cape/Caller's Sash)
Summoner's Pigaches +2 :
Increases Sp. Blood Pact crit. dmg. =
MAB+14 (+4 MAB) if BP 1/5
MAB+30 (+20 MAB) if BP 5/5 (same as wearing Nirvana 85)