Thought this thread would get more traction.
You can get the control geometry you want with most any size control horns. Which size to use is determined by weight, structure, and control wiggliness. We can probably get away with shorter control horns than in bygone days, because now we have stiff carbon pushrods and no-slop ball links. The shorter the control horns, though, the more friction in the bushings.
3/32” wire is plenty for an elevator control horn. Elevators don’t have much hinge moment.
The main issue I’ve had with stunt control horns is bent wire. You can get straight ones by making your own using Derek Moran’s process. Search for it on the SSW forum.