If it is further back than a certain aft position the wing is stalled.
I believe that may be true for equilibrium flight, but not for the sort of dynamic situations we're talking about, and then only for given CoG and power settings.
I would expect that method to bite you, sooner or later, if you depended on it to do a steep turn at low level. And if it were so reliable, why would aircraft be fitted with stall warning tabs and AoA indicators? It would be much simpler to put a gauge on the control column.