Welcome to how Zadnor works with the extra overpowered actions. Sometimes is impossible to reach a skirmish (FATE) there in time becasue they are done with in a matter of seconds. And BLU isn't even allowed there.
As for the Yo-kai fate farming, the problem could be resolved if the completion requirements scaled with the number of people doing the FATE. What happens is that the spawn rate of mobs apparently is bigger with more people doing, but not the number of kills required to complete the objective. If you're soloing a spwan-based FATE as a BLU with just 1 or 2 people besides you, it takes quite a while to complete.
Boss FATEs are not an issue because they (usually) can't be targeted by the 1-shot actions.