Help with my King suspension / stock shock lengh

Hi how are you guys. I bought a 2014 Tacoma with King coilovers in the front and rear shock on the back. On the rear I have a 1" lift block. My issue is. The truck rides really stiff on the rear. after a while driving the truck my back actually hurts from all the stiff bouncing. my rear shock length is 24.29" ext - 15.83 collapsed. Also i just checked and i have 100psi of pressure on the shocks. is there any way to make the truck ride a little smother. I'm just about to buy a new set of rear shocks with the adjustments on it and see if that helps. Also i wanted to add a 2" maybe a 3" lift block on the back. Do i need a 10" travel shock for that? What is the oem shock dimensions and travel length? I'm not sure with the king rear shock is long enough for a 2" or 3" rear block. My truck right now when i measure is leveled, however when you look at it the front looks like it higher than the rear. so i wanted to lift the rear a little to change that.