I posted it on another topic, but I'm gonna paste it here since it's related to goal nets and can be useful to someone else.
I've been trying some different codes to add in locale.ini, in order to get different goal nets and goal nets' animation, but they don't differ much from each other. The three revelant ones, are these:
SOCCERNET_BOX_NORMAL_TENSE_4_SUPPORTS=1 //This one looks like being the standard one from FIFA 17, but since in FIFA 18 we don't have 4 ropes holding the net (only two), it makes the net fall loose. That's why we have such a great animation. Although I don't see it as a "good looking" net, it does ended up having a great net animation.
SOCCERNET_BOX_SHALLOW_LOOSE_2_SUPPORTS=1 //Default FIFA 18 with a bit longer animations? It does feel like.
SOCCERNET_BOX_DEEP_LOOSE_2_SUPPORTS=1 //The top of the net falls a lit bit more than usual.
I also recommend to set the Net Type "loose" in game settings.
I made a video showing them:
Editing the stadiumgoalnetdepth with dbmaster: