Ran into that exact problem as well, the default team is squad 1 (speed 887), which is a bit faster than my squad 2 (speed 742), and a whole lot faster than the rest. So on my first attempt, team 1 was right past the first micropest node (visually, they hadn't even left the node yet) when another team hit the magnifier. So now I move squad 2 to the bottom node, and put all the other squads in the top right, ignoring the top left, to maximize the attempts for squads to catch the last pest in the ring.
I also still have to clear both ?-3 and ?-7. Maybe I should grab a unit with more even speeds for those two maps, but team 1 being a lot faster than the other teams certainly doesn't work out.