You can use some extra leverage... Use a socket/ratchet on the fitting, and use the closed end of a box wrench at the end of the ratchet as en extension on the handle. It will give you almost a foot more of leverage.
primary: Little Sumpin' Tasty
secondary: BBA RIS
kegged: Algebra Black IPA, Mids Pave v4
bottles: Red Light BIPA, Ruination Clone, Mids Pale v3, v2, Deception Sweet Stout V1, V2