The only changes to the instance were the increase in sparkles on a couple items, and the increase in spawns on a couple items. You didn't dodge mobs in there last year. During the conversation before you accept the quest, you are told that the supplies are insufficient, and you will need to make up the shortfall - so you have "some" of the sparklets needed, and will have to scrounge supplies to make the rest. The sparklets pop up and float in the air when you place them, not on the ground. Do you not see them float above you? I cannot reproduce this. The order of placing them follows the order that adventurers have to use them. The idea is that you are rushing in at the last minute to set up the competition run for Boegie, so you place things in the order that he will need them.