Harder bushings like urethane and hard rubber offer less comfort, less deflection and changes in camber and alignment through a turn. Spherical bearings, while they of course can't be used everywhere offer even less comfort and no lateral or vertical movement. Both these options will make your suspension feel much more responsive.
But again I don't recommend urethane.
Brand new OEM will feel comfy and "sprung" because it's new.
Just try to find a brace locally, and don't rule out having an EK9 subframe welded on. This option is even stronger than the ASR, not that most need it.
Are you running stock springs or something stiffer? A giant rear swaybar on stock springs, even with the ASR brace, will sometimes tear out.