coyote6
Adventurer
You can also do things like increase ability scores and give greater-than-average hit points. That doesn't change CR, but gives monsters that are just a bit tougher.
You do have to keep track of the changes, but it's not that much work. With the WotC core adventures, I've just photocopied the stat blocks and crossed out the old numbers & scribbled in the new, using the margins where necessary.
That will only really help if the PCs are only slightly above the adventure's level, unless you get a bit silly (e.g., all the kobolds have Str 16; "It's a tribe of weightlifting kobolds!").
You do have to keep track of the changes, but it's not that much work. With the WotC core adventures, I've just photocopied the stat blocks and crossed out the old numbers & scribbled in the new, using the margins where necessary.
That will only really help if the PCs are only slightly above the adventure's level, unless you get a bit silly (e.g., all the kobolds have Str 16; "It's a tribe of weightlifting kobolds!").