Can an otolith crisis following an Epley be predicted based upon eye movements during the maneuver?

I have completed thousands of Epleys and note an otolith crisis/Tumarkin crisis about one in every 150-200 Epleys performed.  I believe I can almost predict when it is going to happen based upon the way the eyes move prior to sitting up in the last position.  I believe torsional nystagmus in the head down position may be a predictor of the phenomenon to some degree.  I am not sure if my hunch is statistically significant.