I'm not sure what you're trying to express, so I won't stand against your sentence, but the only possible meaning I can come up with right now would be expressed by:
Could you please inform me when you leave?
If that doesn't fit where you need it to, please, provide more info on the context.
EDIT: To make sure I'm not mistaken, I googled both phrases and now I'm even more confident.
When you go is always followed by a certain place or action, like:
When you go online.
When you go to Brazil.
While when you leave simply stands by itself:
If you decide not to go on with this course, please come and inform me when you leave.
Of course, optionally you can add some place after leave, like:
Give me a call when you leave the office, so that I can prepare the food in time.
But this isn't necessary for the word to work.
Both I and you fight for ourselves is correct, yes, but in sentences like these, you usually start with the other person, just out of respect. So it would be:
Both you and I fight for ourselves.
It doesn't necessarily mean that you are fighting for the same nation/cause. It simply means you are surviving your own battles. Even two enemies on a different side in war could make such a statement.
Best Answer
As per means "in accordance with", so "following something that has been decided".
Such as your example: