i got the way to select the zig has data source , but apprentice , you missed a point..
the start always needs to be a zig trough or zig peak , rather than all zig lows or zig highs , that would mark a clear trend start ...
i am attaching a picture to give u some more clear way what the zig troughs or zig peaks ..
zig trough - where the zig low is lower than its previous zig low and its next zig low ...
zig peak- where the zig high is higher than its previous zig high and its next zig high ...