I've noticed recently that the AI in World Tour mode have started hitting a ton of aces against me on their second serves, they often hit a huge serve straight into the corner with a massive amount of kick. I play on Pro 10 difficulty and in general I'm happy with how well the AI serves with their first serve so if there's a way to tweak only the second serve it would be great if someone could help me.
One other thing is if there is a way to tweak how clutch the AI is with serving on break points. This is something I find a little frustrating against players who can barely get it over the net but suddenly turn into Pete Sampras at 0-40.
When you say it's random do you mean there is absolutely nothing going on behind the scenes on break points? Or there is a random chance they will serve better/worse? Because to me those are completely different things.