not an opiton, i have less than 8 - 9 days of riding in a year, so i need them to be perfect.
Only you will know what "perfect" is, no one else can tell you. How do you know when your stance is perfect? You ride and adjust until you think its so.........
If your only riding that many days a year just set it up so its comfortable and forget about it, enjoy your few days of being on the board instead of thinking about whether your stance angles are "perfect".