Offered up elevators, and marked cut line for CS-10 sockets in Canard.
Plunge cut sockets with multitool, and hogged out foam. best tool was a bit of 1" square wood, from the instrument panel stiffner jig, with the tip rounded, wrapped in sandpaper.
Trial fit STBD elevator with CS-11 fitted, balances strongly nose down, but the tip of CS-10 touched the inside of the upper Canard skin before 30 degrees TE down, even without the 2 x UNI over all. Will have to think about this, but will do PORT side first.