VR needs to be closer. POV needs to be closer. Where you are making love with a girl you are inches from her, not two meters away like most western VRs.
The distance of the SLR Originals cowgirls is correct. It is at the actual distance of a cowgirl, and there is no problem focusing.
If you can't focus maybe you have a problem with your player or with the zoom, you don't have the FOV set right . SLR uses Fisheye and it causes problems for some people.
Yo need to set fisheye and FOV to 200 degrees in your player.
What I agree with you is that in the seated cowgirls they always put the camera very low, at the level of the tits, and you only see the girl's chin.
The seated cowgirls should be face to face, like in JAV VR, but I've been asking for this for months without luck, it's a losing battle.