That's all good and well but it really shouldn't be like that. You shouldn't have to find out through trial and error and then have to make a note of the hundreds of leves and what rank their mobs are.
What's the point of some leves having mobs 5 ranks higher than the others anyway? It makes no sense and doesn't make the leve more challenging because it just forced people on to lower stars to lower the rank of the mobs.
I remember this being an issue under the old system too, some leves would have ranks 5 lower than the rest and you'd lose SP or wipe if you set the stars wrong. Dunesfolk always seemed to require one less star than others for that reason and setting it wrong could get nasty.