How do I make D66 roll on Critical Injuries chart more dangerous? In other systems where higher numbers are worse results, I could say "+10 to your roll" . . but with D66 what does plus 10 mean? Literally add +10 . . .but then that means rolls are from 21 to 76 and are all the results in 70s considered equivalent to the 66 result on the table? That doesn't seem right.
I feel like I've read how to make this roll reflect greater danger than normal but the mechanic escapes me.