UndoChiralSplittings is an option of FCPrepareFAAmp. When set to True, it attempts to undo splittings of couplings into left and right handed pieces, e.g. aPLγμ+aPRγμa P_L \gamma^\mu + a P_R \gamma^\muaPLγμ+aPRγμ will be replaced by aγμa \gamma^\muaγμ.
UndoChiralSplittings
FCPrepareFAAmp
True
Overview, FCPrepareFAAmp.