Just touching V-ray, what I've read that sketchup interface is set 1600x900(aspect ration of 2.01:1) whereas Vray default is 800x600(Aspect ratio 1.333:1).
Use closer to 2.01:1 Something like 853x480,1280x720,1920x1080
Anyway I have not gone to that point yet, just starting Vray .
Ref book: photographic rendering with v-ray for sketchup by Brian Bradley page 48