change randomize range to 0.8~1
Revert "change randomize range to 0.8~1"

This reverts commit bc6ff4773b9b8897f5a23a034eb7bdbc4284fc70.
Revert "Revert "change randomize range to 0.8~1""

This reverts commit 40c550701ca0ebda0015502826c2c73b29114163.