I wonder if some of the H&R/Koni's harshness is to do with the bump settings in the dampers because the H&R springs aren't that hard. Low and high speed bump (or compression) can't be adjusted unfortunately. You can only adjust the rebound.
Just to remind folk of the different damper characteristics:
Low speed bump - The damper compressing slowly: brake dive, turn-in, driving up a kerb, B road undulations etc
High speed bump - The damper compressing quickly: Potholes, speed bumps, cats eyes etc.
Rebound - The damper returning to it's static state. This is the one that makes the car feel more 'planted' and sporty. It's the setting we notice the most and is usually the only adjustment offered.
Damper manufacturers would prefer that we trust their judgement on the bump settings, especially the high speed one, but KW do at least give you a low speed adjustment on the V3s.
Personally I think user adjustment of high speed bump would solve a few crashiness issues, but in order to get 3 way adjustable kits, you're looking at the wrong side of £2500. But if you consider what some peeps spend on their Corrados on superficial stuff, personally, I'd rather sink more into getting the car to corner and ride properly.
And just to reiterate, 'coilovers' (or ride height adjustable to use the correct term) as a configuration isn't crashy. They can be way softer than the standard setup if so desired. It's the technology and settings that determine the ride quality. Just thought I'd throw that in as many people automatically associate crashiness to coilovers. It's the cheap £250 ebay specials that give the configuration a bad name.
I tend to think of suspension as a tailored suit vs an off the peg Moss Bros one.