Power Surge Ol’ Snaggletooth (16-17):

Fix.

https://backpack.tf/profiles/76561198192243373#!/compare/1496620800/1496707200

Sold for Logo Billycock (Outdated at 18, mini at 16.5)

= 16

Mini for the Billy: https://backpack.tf/suggestion/595d60a6cf6c751ea346d34e

https://backpack.tf/profiles/76561198173257210#!/compare/1496534400/1496620800

Sold for OF BombBeanie (12) + Spec Shooting Star (~2)

= 14

ADDITIONAL PROOF BY MARTY:

https://backpack.tf/profiles/76561198192243373#!/compare/1496448000/1496620800 - ~2 keys of additional sweets added in sale #2 judging by matching histories - they were re-sold for all the refined in your compare, sale value is closest to ~16 keys

Billy got re-suggested at 16.5, so 16-17 is best here.