You have H&Rs which are already one of the lowests around at 1.5" drop and you want to go lower by 1-2"? Perhaps, you might need to start looking at coilovers or do Shawn's suggestion or perhaps just cut your H&Rs (keep in mind cutting will increase your spring rate). I'd be surprised if you weren't virtually running on your bumpstops though. I ran my car at about 1.65" total drop in the front and that was about the lowest I wanted to go on my Bilsteins.
If you had say... Tein S-tech springs they i'd say swap out to H&Rs or Eibachs but you're already on the lowest springs I know of...
This will help you.
http://daliracing.com/v666-5/catalog/suspension/more_springs_matrix.cfm