Bad advice on shocks? Need guidance.

I bought a '95 Taco (140K miles) about a year ago and the front shocks were very spent so I recently replaced all four with Billie 4600's at the advice of the 4wheelparts online salesman. He said the 5100's were for lifting my truck and would not fit my stock setup. It is a 4x4 SR5 and it has a lifted look to it already.

Now with the new shocks I am noticing a lot more sway and body roll. The rears I took off were not that worn out but I figured I should replace all 4 with the same thing. Maybe they were really stiff, I don't know what they were other than they were white.

So now I'm stuck with these shocks for awhile but should I replace or beef up my springs to flatten my ride? I don't ever carry heavy loads and my off road is about 10% of my driving but no crawling. Mostly just getting to cool places to ski, mtn bike, or fish.

Here's a picture of my springs: