First off, I will say I am a big fan of Tri-Flow.
I am also a big fan of SM Oil.
I use Oil to clean, TF to lubricate.
I am curious about the "dry gunky residue" you discussed. What color? I suspect that the TF is removing/breaking down old Oil still. TF should be mostly clear or whitish when dry.
Open to other views, love to hear dissenting opinions.