[Edi]

#secondaryeffect is supposed to be written together. Further, a weapon can only have one secondaryeffect. If you want more, you must chain them (first weapon has one secondaryeffect, which has a second secondaryeffect, which has... etc)

You cannot mix #secondaryeffect and secondaryeffectalways and make it work the way you do. If you add a secondaryeffectalways to the final secondaryeffect weapon, it is invoked only if its parent weapon is invoked, meaning that only if the initial attack hits. IF you mod the secondaryeffectalways on the first weapon, then no matter what happens, it hits everything in the square and the normal secondaryeffects then hit every single one of those units in a daisychain.

You need to be a little less ambitious.