The way those public events appear work is the more/faster you kill the harder the enemies get. Eventually if you kill them fast enough you will not be able to put out enough damage to kill them, and they will kill you very easily.
I find that if I have to solo the warsat it's easier to kill everything but one mob from the first group and wait. That one mob will eventually walk away and another group will spawn. Just repeat those steps and usually by the third or fourth group you will be done.
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Yeah, my observation is that its best to winnow down a wave to one guy hiding or so, then wait until his buddies show up timewise. Shooting them faster just accelerates the waves/difficulty. Although in reference to the OP, yeah, they seem to have added some upscaling spawns that show up if no low levels are in the area with you, and can get really messy if you aren't good at dropping shields quick.