If you always thin in the same spot, it would lead me to think that is where you are sleeping on it more. Nothing else you mentioned should really lead to thinning in just one spot.

I tend to fold my pillow so it is my face resting on the pillow instead of the hair...to a certain extent. I have always done that since wearing to try and minimize wear. Can't say it stays like that all night, but that's what I aim for. I use a chiropractic pillow, so it has kind of folds in it..so it bends nicely. Next time I want to try a buckwheat husk pillow which I have slept on before away from home, and liked alot.