Hello,
I'm not a huge fan of the brakes either. I find they dont inspire any confidence when making progress. When you put things into perspective its a 1400kg car thats saloon weight (give or take 100kg or so) the evos/Imprezzas/S4's of this world don't make do with single pot calipers. I'm pretty sure the usual pad and grooved disc swap wont be enough. I reckon a new caliper setup will do the trick.
Hurdy; did you find your brakes more balanced with the Tarox caliper? i.e the servo grab was not as prominent any more, it had more caliper feel and bite ? Does that make any sense?