Guys, you must calibrate the HRTF settings or else to be downright honest, you aren't getting 'natural' imaging at all.
Isone is designed to emulate nearfield speakers at 30 degrees, not really as a pure crossfeed.
Also to calibrate it, you really need a good test track with deep soundstage and instrument separation e.g.
My settings and why it makes sense (click image to enlarge):
Your HRTF settings (Head size, ear...