I had Alcons on my old track MKV, that'd stand on its nose all day. Proper stuff, not scene stuff.
IMO you'd be as well getting some decent pads/lines/fluid on your existing setup. I can't think of any iteration of OE Brembo setup on a VAG car that's worked well, compared to a proper Alcon/AP/etc kit. Which is odd, as others make OE Brembo work fine. Both my M135is, my RS200 Cup..