I would guess that you will probably face this somewhat unique issue as long as you wear a partial unit. A full cap is going to "flow" more naturally all the way around. Of course it has several other advantages and disadvantages, but I can't think of any way you could get a partial unit to reliably move exactly like you natural hair moves.

Kind of on a side note, but one of the cool benefits to going with a full cap for me was that I no longer had a mismatch when I would wake up in the morning where my hairpiece hair was going ten different directions and my natural hair was always laying down against my head.