Can you share the whole input file or .pmx file ? Even in private message if you don’t want to make it public. It will be hard (if not impossible) to help without it.
First of all, assign the rigid body constraints to the whole parts instead of just their surfaces to make tools entirely rigid. In the case of a die you will also have to change the region of a fixed BC to the reference point. Then try refining the mesh of the stripper plate. You may also have to refine this region of the blank:
I downloaded the files without any issues. I would recommend Google Drive or Dropbox for storage since the files don’t disappear there after some time (which is often a problem in case of forums) but this one is also fine.
What I would still improve:
rigid body constraints should be applied to whole parts, as I’ve mentioned before (just switch the selection mode to Part)
refine also the mesh of the stripper plate - it’s very coarse now
The explicit dynamics step is not implemented in PrePoMax yet but you can define it using keywords. Check the CalculiX user’s manual for the *Dynamic keyword: http://www.dhondt.de/ccx_2.19.pdf