From your pics, the long turn can use a lot more opening up, IF, the casting allows you to do so?
Another way of seeing how the air flow is by using a stick & attach a piece of tape to it & insert the stick w/tape into the port & see where the tape goes.
Good luck with the porting, it is a time consuming art & takes a lot of patience.
Don't worry about polishing , that is just cosmetics for the most part. Makes the customer say WOW!
What tool are you using for porting & what bits/tips?