Volvo C70 2.5T Coupè 1998 Suspension Comfort Problem

[reise]

Hello.

During the 2018 i start to change a lot of spare parts for suspension and steering for my C70.
The goal is to erase the steering noise and bad comfort of suspension.
I list the new spare parts i buy and installed from mechanician:

BUYED AND INSTALLED

- x2 Front Spring Seat 30683637 (Polar Parts)
- x2 Front Support Plate 31200599 (Polar Parts)
- x2 Front Helper Spring 9140067 (Polar Parts)
- x2 Front Protecting Bellows 9140068 (Polar Parts)
- x2 Front Shock Absorber 9173850 (Sachs)
- x2 Rear Shock Absorber 9173851 (Sachs)
- x2 Rear Support Plate 9461524 (Sachs)
- x2 Front Washer 30647969 (Polar Parts)
- x2 Rear Helper Spring 3516327 (Polar Parts)
- x2 Front Stabilizer Link Bar 31212730 (ComLine)
- Tie rod end Front axle left 271598 (Kager)
- Tie rod end Front axle right 271599 (Kager)
- Control arm front left 8628499 (Optimal)
- Control arm front right 8628500 (Optimal)

A total of 24 spare parts.
Plus, i was send to a steering box repair center, my steering box (was have problem of oil leak and noise during parking steering)

The situation: the suspension comofort was bad and now is bad.
The mechanic told me that he found more spare parts to replace:

TO BUY AND TO WILL INSTALL

- 2x Rear Link 3516122
- 2x Steering Road 9191410
- 4x Bushing 3507923
- Engine Pad 9434435
- x2 Stabilizer mount (Skandix, not provided by Volvo)

In your opinion, installing these last parts, will the suspension comfort return as new? Or will it always remain very rough on road bumps?
If the problem not will solve with this last spare parts to buy i'll buy the new front and rear springs, but is very hard to find.
The code of my suspension (the string code on right bottom of VIN plate) is 46 (front spring) and B (rear spring).
For info: wheels is 7"x16" Volvo Ursa on 205/55 R16 Dunlop Sport MAXX RT (for now, but in future i buy 7.5"x17" VolvoCanisto on 225/45 R17 (that were those with which my C70 had left the factory)).