You would need stiffer springs. Shocks simply dampen, they are not intended to support vehicle weight (i.e. nose dive). The shock's dampening rate should technically be tuned to the spring rate. Hope that helps.
I assume you have an SR5? Test drive a Limited with the xreas suspension and you will find what you are looking for. Some people take the xreas off but is has no nose dive, has firm ride and corners great.