i use a single line static external pick up. i've done some research on this & found the following.
!/ stock 3/8 internal pickup is 10mm
2. stock 1/2 internal pickup is 12mm
3/ single static external pickup is 16mm
4/ depending on the brand, but some swinging pickups only have a cross sectional area of 14mm, so if you run double lines, you're restricted by the size of the swinging pickup which means the static has more flow.
sorry for the metric changeover but i live in a Metric country, work in a metric/imperial job, but play with imperial size hardware on my hobby.
this is the setup i'm using in my current build.

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