(Non-sequiturs and irrelevancies are that source's stock in trade.)
Back on track I use mini and micro servos on my park fliers, so I expect Coos' plane will be OK with the same, as long as the pivot point is located where reality says it has to be.
On my Femto 400, there's Cirrus CS-21 BBs, and on the Yard Stik Hitec HS-55s. As neither plane, nor Coos' will get transonic, these should be OK for the low loads of a park flier.
But also as noted, for manuvering a flapped (seperate horizontal and elevator) surface is better as it can generate higher Cls before it stalls.