Usually when you go 14/14 you don't drone scout because the build is safe against early pool and scouting anything won't change your reaction. I think you should only drone scout if you're doing Hatch first.
I sometimes drone scout and if I see a speedling build won't build my first 4 lings and just keep droning, then pump lings and use defenders advantage (queens+ramps) to get a slight edge. If your opponent goes for a 14 speedling expo and pumps lings nonstop but you go to 16 drones and then pump lings with good positioning you can hold and get a pretty decent advantage in the earlygame. This is pretty advanced though and if you misposition then 4-6 less lings = massacre.
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