When chasing coon,I gang set.I do use fish oil,but spike it up with shellfish oil.
When baiting,I use shellfish bait,or fish type bait on one pocket and a sweet smell on the second---give them a choice.
I have never used sardines,most fish baits I now use are commercially prepared.When I was able to catch smelt ib the spring,I had very good luck with them for coon and mink.Also don't pass up a piece of muskrat in your pocket set for coon and mink.
Marshmallows are more of a summertime,adc bait---when fur trapping,I want something that is able to stand colder temps and reach out to those coon.
Asa's Muskrat lure is also a sweet smell coon can't pass on.
Tom