looks good :rollsmile:
sleeve overs will not drop it any lower than it already is... they could be used to make it a bit higher though...
Unfortunately the lower you go the more uncomfortable the car will get even if you shell out on high end coilovers optimum drop is still about 40mm because lower will cause you to run out of travel and the control arms will sit at the wrong angles...
this makes the car uncomfortable and handle badly...
you can minimise the impact of lowering but using high quality components (Nforce is known to rune the ride

) My advice is not to lower any more and get some high quality dampers (shocks) on there they will improve things considerably but you may still have to change springs later if you want to improve it more...
Koni STR.T offer the biggest band for buck solution for dampers:
R 2900 front a Pair
R 1640 Rear a Pair
I can also offer you H&R or Eibach springs but seeing as you already spent on springs rather change the dampers 1st and see if you happy with the ride after....