I'm very new to VR photography and am on a steep learing curve. When viewing VR 360 sperical panoramas that others have posted on the net, I am impressed with the very high image quality. My own are far less impressive and seem grainy.
I use the Hi setting on my Coolpix 995 (very slow) and have set the Panoweaver output to highest user setting. AE lock is on with largest possible aperture and I have a robust tripod. Best results in terms of stiching are from the 3 shot F1 lens setting and Nikon F8 fisheye but images are still low quality. I can post an image if this helps to illustrate my point.
Nikon Coolpix 995
Nikon FC-E8 Fisheye
Panoweaver 3 (& 4 trial)