I accidentally cleared ?-3, so it seems ?-6 is now my life crystal farming map.
The strategy I'm now using for ?-6: 4 medium/slow teams in the top camp (speed ~500), one fast team in the middle camp (speed 732), bottom camp empty. The center pest trolled me one time, with all slow squads taking the top route, but the fast squad *did* manage to clear all pests in the lower part on that run, so the timing of the squads is right for a full clear. Eventually, they might even get it right some time while I'm farming.
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The scroll banner below the game now says the game is going into maintenance at 11 AM UTC for a fix.