I don't think you can really have too much as long as the radiator still gets air. I'm not sure about teh cutout youve made to accomodate the V bar - I imagine that would negate a large portion of the scooping?
Here's mine that I made:

I've had the scoop on for months now. I can't confidently say it does anything but it was fun to make and the idea of it is neat so it's stayed on
Here's mine that I made:

I've had the scoop on for months now. I can't confidently say it does anything but it was fun to make and the idea of it is neat so it's stayed on






