Yep sounds like you don't have a brake problem at all.
Over the years this is sort of a common theme with the brakes on an LX. The stockers are actually well suited to street use. Even heavy street use. In addition to the suspension issues, someone has already mentioned a potential problem and it bears repeating. We have BIG and *heavy* cars that have big and powerful motors. This lends itself to fun, which leads to brake use thats heavier than you might think. In particular... hauling the car down from speed and holding your foot on the brake pedal at the light. This causes a hot spot on the rotor and can lead to pad transfer onto the rotor, which creates a judder and fools the driver into thinking they have a recurring warpage problem.
Impermanent solution is to bed the brakes - basically scrub them clean. Long term solution is to learn how to brake a heavy car that you beat the $hit out of, whether you realize it or not: Stop 2 carlengths back from the guy ahead of you at the light and creep slowly forward, keeping the pad rotating around the rotor instead of sitting at one spot. That takes some practice, patience and the willingness to look a little weird to other people at the light. Easier solution is to stop, shift into neutral and take your foot clean off the brake. Makes for exciting times if you aren't on flat ground. Or don't change your use pattern and just re-bed when the brakes are juddery.
Regardless, don't expect drilled rotors to help. Drilling is for bling only. If you like the bling feel free to lighten your wallet, but don't do it to increase performance cuz in this day and age thats not what its for. Rotors should run you less than $50 each and you can get perfectly good ones at RockAuto. I buy SRT rotors there for about that price and they are perfectly in spec for both weight and dimension.