In my opinion its ya shocks mate. I almost went for the bilsteins, they are great on the track but not that great for practical daily road use. I was warned off by a guy who had them removed after only one week as it was too harsh a ride, he's had new bump stops too!
I went for Koni's adjustable with eibach springs in the end. I fitted new VR6 bump stops when the susspension was changed. I'm on 40 profile tyres at 35 psi on 17" wheels and my ride is beautiful!!!
I've had the koni's on their softest setting since new but now they are bedded in i may stiffen them up a little. Ride is not at all harsh, similar bump rate to before but much firmer rebound and no body roll. Car goes round corners like its on tracks!
My advice would be to keep the springs but sell the bilsteins, get some new bump stops and fit some Koni's. You can keep ya drop but you will have a much nicer ride. Change all your bushes at the same time and it will feel like a brand new car!
Hope this helps.
