Soft kyosho shocks?

[Benjab]

Hey! A got a secondhand slash 2wd a while ago and it came with kyosho dbx shocks and i bought some 45w oil and putted it in the shocks. But it feels very soft. Im using the stock slash white progressive springs. I cant really jump with the truck because its too soft. I thought 45w was pretty thick? I dont really know what pistons im there.
Will i need thicker oil or stiffer springs?
Do i need stiffer springs or thicker oil? And does pteload spacers have anything to do with how stiff the suspension is?

If you dont know the shocks you might want to look at this pic http://www.redrc.net/wp-content/uplo...yoshodbx-3.jpg