I'm an amateur, but I've listened to a lot of folks who were willing to share the info. You have the gist of what's needed listed above, but where it gets technical is when you start to really think about what it takes to create a better combustion. Not just domes, but physically aiming the ports in a way so that as they flow, they go to an intended area with out disturbing one another. Using ports to help push/pull the mixture when it's needed. The real results will obviously vary from cylinder design to another, and knowing how and what to do is gonna come with experience.