Flexible 80a Support Sizes

Hi guys

Iam having some major printing fails with the flexible 80A resin and need some help.

how would you guys print that object ?? (STL. file rumpf_ attached) size of the object is roughly 50mmx50mm.
my prints are always stuck to the tank after finishing the raft and started with the supports.

thanks for your help

rumpf_offen1.0-27.12.20.stl (858.8 KB)

Print setup