The PVR lightening is calculate by ground plane and other models, whose react with other models(cut?contract?react?...don t know, how to discribe it:D).
Try to set UNLIT flag + material unlit(together)-(all models)
Set a Ground Plane below.(Static block flat rendered)
(and it doesn't need to, I guess, static lightning needs to affect on models, or am I wrong?)
you are wrong.