once a gtp is on a perch its on there . unless the snake has some kind of neuro problem, or bad equilibrium ,it will keep it comfortably on the perch .
the less stress the better and the most stress easing for a GTP is coiled on its perch ..

but again like i said everyone has their own way of doing things and their own opinion . my way has worked for many years without problem as im sure your way also has same outcome . i offered a way that works well cause he asked for help . hes heard both methods and he can choose which way he wants to do it .