Are you sure all of them count?
Bomb and Power explode, but does it explode more combined?
Alchemist's fire and rum create a fire floor, but don't just Alchemist fire create the one tick of fire damage?
Doesn't the bomb go off on it's own, so the Alchemist's fire isn't needed as the bomb will ignite the rum?
The bulb + other is great through, because of the range of a bulb effect will pull enemies close. Only problem is the shortage of bulbs, unless you, like me, like to do underdark before the goblins, as the underdark in a none murderhobo playthrough has a bulb vendor.