Spring rate???

[dennis68]

Question about spring rates as I am getting ready to order some coils. I am currently running 400lbs springs in the front with 2 coils removed so it’s probably more like 500lbs and 160 lbs coils in the back with 1 coil removed. I know that it’s probably a combination of my poor OE suspension and my hack lowering that has terribly goofed up what was a bad idea already. When going over bumps, especially in off-camber corners, the entire rear end has a tendency to “jump”. I mean it really hops off the ground and around, kind of scary if you are not excepting it. My question is this, what spring rates are we running out there on there street and how do they handle everyday driving? To qualify to answer your car actually has to drive under its own power more than 10 miles a month. I am looking for real world feedback, guys who drive their SCCA cars to/from the track. Is my experience thus far the garbage suspension or does running track type spring rates on the street bring this kind of trade-off?
I worked on a Camaro years ago, it was an 88 IROC that I threw a whole bunch of bolt-ons at (customers money). It got 750lbs front coils and 175 rear coils with Bilstein struts/shocks. On a 245/50R16 GSC it actually didn’t ride harsh at all, not like my bucket which leads me to believe its suspension not coil rate. Thanks guys.