mate thats a funny post "ive fcuked my bumper for being too low oh and rash i dont think i my coilovers can go low enough!"
there are ways to make them go even lower but you will start to makethe handling worse

but it looks the muts nuts imo
take the rear adjusting RINGS off the adjuster but keep adjuster in to get that extra 10-15mm lower or take the whle adjuster out and get an extra 30ish mm!!!!