The AR point always reminds me of the (A) in an Elliott corrective wave and then the ST as a (B) so I would expect the AR to always form at a point less than the PS, which is (4) in the Elliott corrective. So in a roundabout way there is a way to tell when the rally will end - somewhere less than the (4) , which is no greater than the PS.
After all that then we watch for the anticipated 5 down to a spring - which is not easy.
