On the topic of airfoils, especially symmetrical ones...
Turbulence isn't the term you're looking for, its drag. The thicker the airfoil you select, the more induced drag you'll have to deal with. Great for low speeds, but performance suffers at higher speeds. In general terms, thinner airfoils are more suited to high energy maneuvers as they're generally easier to stall (important for maneuvers like snaps, spins, blenders, pop tops, etc...) and thicker ones handle low speed maneuvers better as they have a larger boundary layer (this is the area of attached airflow which will depart the wing in a stall) and improve control authority at high angles of attack. The only "turbulence" you're really going to be worried about on a model that can be designed out is wake vortexes, which are a byproduct of lift. Wing fences can help with this, BUT on a 3D plane you're better off going with side force generators, which help the aircraft track straighter, gives it more authority in knife edge, and helps to reduce wake vortexes. The vortexes increase parasitic drag, which will become more apparent as speed increases.