Block atol not small enough

May I know which command can I use or change to make the block atol more bigger?

In UDEC, I use block tolerance corner-round-length xxxxx at the very beginning just after model new to change the tolerance. May be its the same. Please confirm.

@Ray You are defining the Fish-function abc to change ATOL, but then you are not actually calling this function…
Also the block tolerance XX command should do the same.