no variation in rebound (Shiver 45)

[Klausen]

I have a 2006 GG 250 Marzocchi fork
my weight 85 kg without gear
my Fork specs:

130mm air
4,5N/mm spring
6mm preload
SAE 5 oil

Rebound stack:
21 x 0,1
21 x 0,1
19 x 0,1
19 x 0,1
18 x 0,1
17 x 0,1
15 x 0,1

when I open or close the rebound screw full I don't feel a difference
What is the reason?
Is the thin oil bleed to much beside the first shims.
Is a 22x0.1 Shim better - I want continue to use the SAE5 oil.

Another problem is the fork feels a little bit uptight on the first 3cm.
But the forks are parallel and the srews have right torque.
Why?