Why is this so horrible with a wand...?

I haven't tested with my Elf since it has Rank F EMM, but I think it's only strong on wands when you select the respective element for the wand (e.g. Fire Wand and land on Fire) unless that does absolutely nothing, and also apparently if you let it charge nearing the end it does more damage, similar to GFS's Number of Round Swings, so try "charging" it as long as possible before automatic cancellation. It could also be that since EMM acts on percentage similar to Smash it can't be translated with Magic Damage and therefore you get low damages. Or unless it uses a different mechanism but as you can see no one bothered to check for the percentage on wands.