I don't think the stats are that clean. for example the weak has a 2/9 chance of hitting scum, but he must be protected, which means the CPR doc needs to use his role, and needs to use it right which is a 1/9 chance. 1/9x2/9=2/81. though if we lynch it's more of a 2/8x1/8... 1/32
This is a puzzling game, I can't think of any best option.
I was thinking that one person could use his night action to scum hunt, and everyone else would use their NA to protect him. However that would just be the same as not using any NA. I can only think to have to groups, both group would have one person each to scum hunt, and then everyone else would protect him.