full point of c/r increase should roughly (and this is a very rough estimate btw!) increase hp by 3%. Not that much unless one has the right combo and the right fuel to accommodate the higher c/r. As is often stated, a 10 to 10.5 to 1 ratio is about all modern pump gasolines can handle although some combos could go a tad higher. Race engines on race gas are, or course, a whole different, story.
It does pay to check the actual or true c/r on even a street engine as often the real c/r is far less than then one may think. Why leave hp on the table if the calculated c/r say 10 to 1 when the measured c/r may only be 9.2 to 1?