iPhone 5S Long screw Damage (anyone good at it?)

Hi guys ;)

I'm not sure if this is the right place to ask this but.....

I've done a bit of micro-soldering in the passed so i thought i would attempt this repair.

I've stated gently scraping at the board so that i can see the tracks but I'm a bit unsure if I've gone too deep as from the pictures and videos I've seen online they seem to go very deep.

here is a couple of pictures sowing both screw holes:

And this is the board looking at it with the naked eye:

As you can see i gently removed to top coating (black) but now there's the copper layer and im unsure if i should keep going as there is a kink of look of some tracks but then this could just be the effect of remove the top layer.

So have i gone too far or should i keep digging ?