3D Embossing - packing, how to prepare press and etc.

Hello everyone!

I got relatively close to achieving good 3D sculpted embossing cliches on my CNC and casting counters with different types of resins onto fiberglass board.
I am making 1:1 cast from the counter and removing the background (some thickness off of the fiberglass board) in order to not print the holes and the background of the female die.
I am probably not doing correct packing of the letterpress, because I can not get 100% if the details I want.
I have had success when putting pieces of paper with the shape of the design, or cardboard which I cut by hand. Only then it looks fine, the paper is pressed hard onto the female and I get amazing detail, however with complex design dies I cannot put piece of paper behind every element. I have also tried putting double sided tape only under the image, but still very hard for complex designs.
Is there some trick or technique in order to get nice, even and crisp prints?
I am using old manual Boston Tiegel letterpress A4+ size.
Any help would be appreciated.

Thanks in advance!

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