Bigger is not always better. I don't do custom porting but I have seen a fair bit of it in my job. As was mentioned on one of the other pictures that you posted the surface on an intake port should not be glass-smooth, it needs a bit of texture to help keep the mixture homogenous (sp?). If it's smooth the fuel sort of sticks to the port wall. A professional porting job is arrived at by a lot of experience learning what doesn't work and some time on the flow bench to confirm that the things that normally work, work in your application. Most spend a great deal of time reshaping that short turn radius and making sure that there is no lip or hump there to separate the flow. Good luck on your project and let us know how it turns out.