I was able to tighten the top of the shocks down using this method http://www.purems.com/products/page.php?pageKey=23 It stopped them from making noise and solved the problem with my hood.
I did a 1,5 drop with H&R springs and koni yellows this spring and that works just fine for me.
MJM Autohaus is where I got my Koni adjustables and Neuspeed Sports a year ago- dropped me about 1.8" all around and the ride is sublime!
I have the same knocking sound. It has lessened since I had the Konis out for adjustment though.
I've had NS race with koni reds for 3 years and they are perfect..and I drive down steels to York U 2 times a day
It already has Koni's, and I'm designing a DIY front stress brace set.
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