Uneven impression on Windmill

I am getting an uneven impression on the windmill. It is deeper on the bottom of the page, and lighter up top. How do i go about fixing this? I am not positive what to do!
Thanks.

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Your packing on the tympan is too thick.
There should be a packing gauge cut into the left hand delivery standard, together with the instructions; if this is available, use it!
Reduce the packing and increase impression using the adjustment on the impression throw-off lever.

Thanks Bern

So, if this is the case then the reverse, (more impression at top, away from guides) would mean that you do not have enough packing????
What material is best to use for packing under a tympan sheet?

Read page 46 of the manual available to download from Boxcarpress