I think most gardeners could write a book on these.
I too have tried everything from beer traps to slug bait.
I've gone back to just using organic slug bait, if they eat more than their share.
I also hunt for them after a rain, early morning and before dark with a bottle of a homemade concoction.
I use a spray bottle 3/4 filled with water, few drops of liquid soap and 1/4 cup of ammonium.
Then I just squirt the chlorophyll suckers whenever I find them.