Once you have upgraded the stock system (which is already substantial for most ek9 owners) the only 3 things to be gained from larger brakes are-
1- looks
2- better heat holding capacity for long excursions at the track
3- Usually more unsprung weight, which is bad
I recommend a good set of pads, I use hawk HP+ for the street, and a full fluid flush and bleed with good fluid. Good fluid would be motul RBF600, amsoil series 600 DOT4, or ATE Super Blue. Stainless steel brake hoses and sticky tires are another great brake upgrade.
If you still get brake fade after doing the fluid and pad change, you can try brake cooling ducts from the front bumper.