I haven’t used the OP’s particular spring in a while, so I won’t say for sure this is how they still are....... but the ones I have used had a pretty small diameter inner coil that had no interference fit with the damper.
The spring I recommended is a dual/no damper that has a slight interference between the coils.
My feeling is this....... springs aren’t going to fix it, but what it has in it now for springs aren’t adequate.
So, install springs that are.
If that proves to still be unsatisfactory, you’ll have decent springs on the heads that can accommodate a nice SFT cam.
