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Hi,
what are your cold tire pressures? what is your actual wheel alignment setup(toe&camber,front&rear)? are your rear control arms bushings ok?
...front to rear tire pressure distribution changes steering weight.
...front toe changes on center steering feel.
...excessive rear toe-out can cause rear end weaving and reduced reactions to steering inputs.
...not optimal camber and toe values (understeer prone) can enlarge the body roll.
One owner of Ventus V12 on tyrereviews.com (driving older Type R) mentioned lack of feedback on the front, and weaving on the back. So it could be also caused by your tires. Try possibly e.g.Continentals (or Yokohamas), they usually have more precise steering.
STI long bolts with the whiteline steering rack bushings will help with steering feel. Easier to fit are Perrin steering rack locks, will bring yet more feel, but also slight NVH to steering on bumpy roads.
Sway bars upgrade will help with body roll, but not with the heaviness of steering feel. (and requires dampers and end-links in good condition. Stiffer sway bars may also overwhelm the softer sidewalls of Ventus tires on quick direction changes.)
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