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what is a proper cooling fan set up

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I took my stock fan out and used the shroud to put in my summit fan. I say it has twice the ccf without looking. Less amps and more air was the reason i got it.

The stock shroud covers 7/8 of the radiator.

Do i need to fill that gap that the shroud does not cover? The top is good and the bottom. Just the pass side is visible.

The fan is about 4 inches from touching the radiator. It does slightly pull air from the engine bay on the gap side.

So does a shroud need to create a vacuum with the fan or is the fan strong enough that a little slop wont matter?