10-5 caused me a ton of grief; not only because there's a bazillion different direction panels you have to pray to RNGesus to get right, but it was also super easy to accidentally finish up the stage first, before you're able to finish mopping up all the pests and bosses on the map. Just running through the panels alone 100% correctly happens only on about a rough 10% chance, give or take depending on placements you might gamble on.
To finally nail down the 3-Medals, I had to purposely set up 2-3 of my squads to be purposefully slow, with no more than 450-Speed at max and make certain that the Northernmost squad had both enough firepower to take out the first boss encountered, but die against the final one. The placement of the rest of the team descended from North-to-South in order by speed, from slowest to fastest, with the two fastest squads occupying the same start point at the bottom of the map.