Crank,

When you make a hatch (drop form?) over the outside part of the servo then it has less resistance (drag) than without. It is also a solution to keep them dry when it rains.
Try to make the angle of the backside less than 10 degrees (related to the surface of the fuselage) to prevent turbulence, better is 8 degrees. (angle x).
Of course you make the left and right side of the fuselage the same! Both side need the hatch.
Remove the unused lever of the servo then you can make the hatch as small as possible.

I prefere the servo's in the centre section of the fuselage so I cannot give examples with pictures,
The hatch also protects the servo for FOD, that's why I prefere the servo's in the fuselage and most of the linking !!!!!

Cees