E2-5 is very tricky from what I've seen. You need to have 5 teams with descending speed and alternate power. What I mean is that the first team must be very fast but be considerably weak so that it'll beat the first enemy, fail at the next enemy or even at the last boss. Around 20k Power is A-OK. Second team must be a little slower but very powerful (40k was enough to clear all the normal route enemies + last boss with a little help from Solar Blast). Third team slower than the second but weak as the first one, the helper squad one even slower than the third and strong like the second (or even more) and your fourth the slowest but weak like the first and third. From that point and on, it's all RNG that both of the teams that went to the cobwebs will get to the right routes and get the enemy AND the boss. It took me 2 tries with the aforementioned strategy to pull it off.

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E2-6 requires some RNG but with right calculation it is doable.

I put my first team at 72k power with a speed of 490 at the bottom camp along with my second team which had 50k but was a little faster with about 521 speed. My third and fourth squads went to the top camp with ~30k power each and a moderate speed of 500. The helper squad was weak with 25k power at the mid camp.

With this strategy only one team would advance from the boss at the top camp because Champ Ken takes 90% of HP from every unit it hits. The third team killed the first enemy and almost killed the boss square (sometimes it survived with only one member) and the fourth finished it with heavy damage from Ken. That way when they reach the last boss they get taken out with what they were left. The Helper Squad at mid camp needed to be strong enough for the first enemy but weak to die in the last boss should they reach it first. As for the key squads at the bot camp, the speed at the first squad needs to be below 500 so they don't hit the arrow block first. The second squad needs to hit it and go through the webs. First squad will reach the enemies at the top first. From there it's RNG if you get the right route at the top and the second Champ Ken boss at the last paths.

3 medals at second try with this strategy.

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E2-7 is very easy and requires only a little RNG.

I put the first squad at 55k power with a high speed of 651 at the mid camp in order to go through the cobwebs very fast. Second squad got to the top with 34k power so they would hit the arrow block and follow the top path. The enemy blocks only have one enemy so it's more than enough. The helper squad had a speed of 527 and went to top camp with the second squad. The first squad passed the webs first and reached the boss before the helper squad. The remaining two squads had about 33k and 55k power each and a speed of 408 and 480 respectively. One of them hit the right route at the beginning and reached the final boss just as the second squad did from the top.

3 medals first try with this strategy.

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E2-8 is a stage that I got a little pissed about, maybe because I could get 3 medals first try as I was testing it only to have my third squad slaughtered at the bottom boss. I still haven't managed to 3 medal it, since 80 stamina is very costly and I ran out of it.

I used my casual team setup and the default squad starting points. My first (72k) and fourth (37k) squad at the top both went through the cobwebs and reached the boss. Nothing hard there. Third got slaughtered at the bottom boss mainly because they only had 37k power. Not nearly enough to get through it. Second squad got to the final boss but got eliminated there even though they had 50k total power. But they almost cleaned it. The Helper squad picked it up from there.

In the end 23/24 medals for the time. I'll wait for my stamina to be fully back before I try this once more.