Models don't fly at Mach 5.
For a model jet, the thinnest trailing edge is best.
Many gliders go for really thin trailing edges also.
Indoor 3D planes have blunt leading and trailing edges.
.
"The model's purpose dictates the shape.
Fast and slippery, needs to be tapered.
Yank and bank, machs nichts!
Weight hanging off the hinges, without adequate support from the servo connection, will flutter regardless of the shape."