Damn, sorry for being late to this party..........
Porting is a waste of time and money - done by an amateur home-schooled gunsmith, it will ruin the value of the gun and solve nothing. As it is now, it solves nothing. Done by someone with a Shopsmith, I can't imagine the outcome.
I shoot sporting, skeet is when there is NO ONE on the 5-stand or sporting fields. To make it challenging, shoot it low gun, don't worry about the stake or your score - work on your low gun mount and reading the target.
Then move to the 5-stand, and then to the sporting field.(and then to the FITASC field)
The ability to Move, Mount, Shoot consistently will make you an excellent shooter
All of that, (to keep this on topic), will replace ANY benefit from ANY type of porting