I've linked the project here if you want to see first hand, but in a nutshell, yea i'm doing a:
angle(box.X, Box.Y, touch.X, touch.Y)
the fling effect is achieved doing a:
physics impulse distance(box.X,box.Y,Touch.X,touch.Y)/2
so yea if I follow you correctly, I'm not using physics to set direction and don't know how to do that. Any suggestions? I tried things like Physics Force At Angle (not sure i'm using any of them right) but it didn't seem to yield any results.