Thumbs up for this project, anything that makes the game more realistic is always a good thing. I'd certainly like to try this and give some feedback if this is available for the PC.
Couple of things though, I'm not sure you understand the aggression stat properly. In PES it doesn't mean how aggressively a player tackles, it means how aggressively they get forward, so someone like De Jong, an aggressive tackler, will have a low aggression stat in the game because he doesn't join the attack much. Someone like Lampard, not really the tackling type, will have a very high aggression stat in game because he makes endless attacking runs. I've never really worked out which stat is equivalent to real life aggression. Not sure there is one to be honest, which is a shame as it would add a lot to realism coming up against your typical dirty bastards and seeing them rack up the yellow cards over a season.
Also, if I'm a top team, I don't think every single game should be a challenge. Look at Wigan losing 9-1 to Spurs last season, 8-0 and 6-0 to Chelsea, Blackpool conceding 6 vs Arsenal, Feyenoord losing 10-0 to PSV, Madrid and Barca often going goal happy in Spain.
I think there still needs to be a discernable gap between the biggest teams and others, allowing me to rest some star players in anticipation of an easier game or perhaps go gung-ho and try to make up some goal difference. However, should I play really badly or if my team form is low and the opposition form is high, there will still be a chance of losing the game.
Of course this is not a put-down of your file, as I haven't even tested it and I hope it turns out to be a great file, making the game more realistic. Just a concern that I hope you can address.