Dunno if the brakes are the same on the ST as the normal TDCi (I have a TDCi daily driver), if so then there's not much available
I tried EBC on my cossie when it was just a stage 1 and they did nothing but warp discs. The back ones actually delaminated too which could have been nasty! I rang EBC and they tried to blame my brake hoses
In the end I went to Ferodo DS2500's which were much better, but I don't think they're available for the mondy
I've just fitted new ford discs and pads all round to the mondy and it's made a big difference, going to replace the fluid with something decent as soon as I get a spare couple of hours. Hopefully this will improve things further.
HTH
Neil.