Spark Run sweet spot?

Hi, due to time constraints I find it tricky to farm enough gold/pigs to keep up with spark run costs.  Also, spark runs c and take a while if I don’t have the right ninja members to boost the numbers. I’m using a level 15 Mirage with maxed gear.   he’s fine around level 250 but starts to struggle a bit, so needs support - I’ll often use my maxed superion but then that limits my bonus squad member to one. anyway, is there a sweet spot on the level choice that gives a higher spark return va cost of coin/pig? Or are there level breaks that are faster than the previous level due to the bump in points awarded? Or perhaps there are levels known to be faster because they have a tone of gold boxes (tbh I do t even know if they are random every time or if each level is scripted). I’m basically looking for efficient, fast , safe spark run level for a maxed Mirage, Superion and +1 bonus member. many thanks for any help.
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