Everyone has their own opinion.

If your KYB's are working, keep them.

My Mazda club guys like K-Sports as a shock, since they are adjustable
for street driving and then harder for track.

When you can get name brand springs and shocks at ebay prices,
you got a deal. Off brand springs and shocks at ebay prices are not a good deal.

Springs that are too hard cause loss of grip in the turns except on really smooth pavement, that's why I prefer spring rates close to stock, since that is what the car was designed for.

There is far more to handling than setting a car low..........

People who don't know how to measure a suspension don't know how to cut stock springs, that's why they think it cannot be done. My personal car has cut stock coils which lower it by 3" and you can see the photographic proof when you see me at the meets.

A spring that is too short is too short whether you paid $300 for it,
or cut it too short all by yourself. Cut springs don't destroy suspensions, Springs that are too short destroy suspensions. People who don't know how to measure a suspension usually cut them too short, and then claim it cannot be done.

I am the only person on Tampa Racing who knows how to carefully measure a suspension and cut springs without blown shocks, without beaten up suspensions and without eaten tires. -Bob

Maybe we can take a look at your suspension and see if you can safely go lower.