....Another vote for AP Racing's Big Brake Kit !!
But changing to a different pad plus braided stainless steel lines plus fluid might help, but it all needs to be appropriate for your particular discs....Take care.
Very, Very nice brakes on your Ed30, 182_blue

I did some minor development work with AP, and I'm advised that you don't really need 6-pots on the Mk5 Golfs and you only need the AP's on the front, all due to weight of the car relative to the brake's power. 4-pot will suffice

(and save you money)
