Jay, the THX optimode on those disks you have don't really have much to do with EQ, but more for balancing your speaker levels. To use the test tones ( for equalizing a speaker system ) from THX optimode, you need a Pre-Pro system along with a 1/3rd octave EQ device hooked up between the amps and processor. And to analyze the data you will need a realtime analyzer along with a calibrated acoustic mic.
Anyway, I rarely watch movies at a theater anymore because sound is so crappy, shrill and dull, and if it's not so shrill, it's definitely dull.
And your absolutely right, the sound will only sound as good as it's recorded.