new shocks to stiff of a ride, need advise

I put new front and rear Monroe “sensa-trak” shocks on my reg. cab 2wd Tacoma a few days ago. I got them at Advanced Auto They had two options this shock and some other for half the price. I went with the Monroe because the counter guy told me this shock provides a much softer ride. The rear is a gas shock. It turns out the ride is real rough! I’m going to take them back. The truck handles good but I feel every little bump, it’s like riding a go-cart and its killing my back. Can anyone explain why it’s such a rough ride, should I not use a gas shock. I think most the rough ride is coming from the rear which has the gas shock. Here are the two part numbers of the shocks 37111st and 37112st

Thanks !!

 

Buy some qa1s lol they're hella stiff compared to those lol