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I have the Ridetech HQ series coilovers with the standard 275lb front and 500lb rear springs on my car. As far as adjusting to negative preload to lower the front ride height, that just doesn’t sound quite right to me either. But, if the Ridetech technician says it’s okay to do it then I’d probably trust that he knows what he’s talking about.
The only thing I might mention is, the way I read the “coil spring adjustment” part of the instructions is that “if the car is too high w/0 preload then a smaller spring rate is required”. What I think that means is the same length spring with a lighter spring rate would allow the weight of the car to compress the spring farther. So if you now have 375lb springs in front then going to 350lb or less would lower the ride height.
Just curious, have you measured the the wheel or shock travel to see where the shock sets at your current ride height? The instructions say “the shock absorber needs to be at 40%-60% overall travel when the car is at ride height”. If you’re out of that range then that would be another reason a different spring rate might be called for.
I see what you mean about a shorter spring having the same effect on ride height. You could keep the same spring rate you currently have and simply lower the ride height. That sounds perfectly reasonable too. Did you ask the Ridetech technician about that?
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