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I have a professor that I took 4 classes with in undergrad. He is willing to raise the A's I got to an A+ in each class since it doesn't affect the GPA my undergrad university calculates. I'm wondering though, if law schools see the previous grade listed as an "A" and changed to an "A+", will this cause them to realize this was just done as a GPA booster? Or does it not matter since LSAC is calculating GPA?

LSAC doesn't evaluate things like that when calculating your GPA.

I suppose that if someone in admissions actually looks at your transcripts (assuming your transcript would reflect that the grades had been altered after the fact), they'd notice that it's a rather dishonest move. But ultimately, the LSAC-calculated GPA is what matters.

Law schools wouldn't see this, nor have any way of even detecting it unless you applied previously and even then the academic summary report would make it damn near impossible to figure out unless you took all those classes in one semester.