Thanks.
I found it helped a bit to have some kind of reverb like the Ambisonic iem one on the sound too so it had some delay difference between the dry and wet part of it. Helped to localise it.
I'll try myself too set something up in vr at some point and use the steamvr binaural stuff or Google or the Facebook one.
It might be that it's so easy to localise in vr because of the constant slight head movements we do without being conscious of them as I can even close my eyes in vr and still know exactly where a sound is above/below/behind etc.
Either that or their default ear model works much better anyway.
My dream is to be able to take these ambisonic and atmos mixes I'm doing and easily out them into binaural so that people could get the effect in headphones but not sure if that's the case yet.
Hopefully so!