The recoil spring will not have much influence on the direction the brass is ejected. It does influence the distance the brass is thrown from the gun.
The two key parts you need to concentrate on are the ejector and extractor.
If both of those parts are tuned correctly brass should not be hitting you. There are other elements that can be effecting the extraction and ejection of your brass, such as timing and the position of the rounds in the magazine.
Keep in mind that a 1911 45 torques to the left so with a loose or weak grip the ejection port will be turned in a more upward position.