Also another flaw:
If you are farming 5 toons from hard nodes, the drop from 8 attempts to 5 changes nothing. It just means that your energy is spread out among more toons each day.
If you are only using free energy (I think that’s 375/day), then you are doing 18 battles/day (at 20 energy each).
With 5 attempts/day instead of 8, that means that you are farming 5+5+5+3 (4 different toons) instead of 8+8+2 (3 different toons).
Either way, you will still get the same number of shards each day just spread out differently.
18 attempts x drop rate = x shards/ day, regardless of whether they are for the same toon or not.
And since you are apparently only farming the teams that have every toon in hard nodes, it changes nothing for you.