K dosnt mean thousand, it means kilograms. The springs are rated in kilogram/millimeter, or inch/pounds.

So that should solve that problem.

And stiffer springs will do nothing unless matched properly to the correctly dampened shock. Everything has to be balanced.

The reason coil-overs are so popular and in fact give you amazing mechanical grip over springs and shocks is they are:
1 have stiffer springs rates so the car dosnt have as much lateral motion giving you more control
2 the shock portion is alot shorter stroke
3 you can adjust them to your liking if you bought a decent set through spring preload, dampening, rebound, ride height ect ect.
4 you can buy multiple springs with different rates and have fun playing around.

Some of these people just need to read a damn book, to atleast get a general Idea on how this stuff works and stop asking internet forums and getting wrong answers.