First off sway must be defined. Many call the suck and pull from trucks passing sway. I don't think so.
Many call being blown around by the wind sway. once again no, although sway can be precipitated by either of these
Real sway can be compared to "death wobble". A combination of events and physical characteristics combine into an unstable condition.
Swayis most often induced by being tail heavy and the vagrancies introduced by being unbalanced
Personally just from the information here ,I would say 33' is too long.