The smaller diameter bars will give you a softer ride as long as they can support the weight and are not on the bump stops. I suspect there isn't much weight difference between an all aluminum Hemi and a factory loaded small block.

Back in the early days, Direct Connection suggested that you replace the bigger factory T bars with smaller T bars to aid in front end lift and weight transfer. You already would have those suggested smaller t bars. I suspect your sway bar probably eliminates any advantage those lighter bars would add anyway, the DC also suggested to disconnect both ends of the sway bar for drag racing purposes.

Personally, I would run what you have as a street driven ride, unless this turns into a strict drag racing machine. My comments are all based on old tech from a book, from a guy with a lot of street action, but with no real drag strip experience.