Do bigger tires = Stiffer ride?

[Hairlessape]

ok.. first post on the forum.. have had my H3 about 2 months and I am a gearhead little brain.. in other words I know next to nothing about automechanical engineering. That being said.. i have searched extensively on this forum for answers to my questions to no avail so I am hoping someone will have mercy on my ignorant newb a$$ and just toss me a couple freebie answers.

One thing I did know when I got it was the tires were too small. so I went out and traded the 265 Wranglers for some 285 BFG T/A's now before I get flamed for not getting the 315's the reason was mainly money.. the guy gave me a deal on the 285's and would have sold me 315's for full price with no trade for my old tires.. so I took the 285's which I think still look great especially compared to the old 265's However.. I have noticed the new tires provide a bit of a stiffer ride as well as a slight loose feeling in the steering wheel. My question is.. if I was to start adjusting the torsion bars.. which I have not done... would this improve the smoothness of my ride or make it worse?... I know the torsion bars adjust the height of the vehicle but do they affect the smoothness of the ride? If not is there a way to get back to the smoother ride I had with the 265's without having to run 265's or buy new shocks or spend a whole lot of money?... I have the base package Hummer and love everything about it and can actually live with the stiffer ride.. but if something can be tweaked to get it back to what it was I would love to know...

Thanks in advance.