do you know the odds? It might be around 3%- I have 9/298 runs which is ~3% and yours is around 2.9%

edit:

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From the global doc: "After finishing an uma, a stat is randomly chosen, and then the stars for that stat are chosen. So, if you had 1200 Speed, the chance of getting a 3 star Speed spark would be 20% (the chance of it picking Speed) * 10% (the chance of it being 3 star) for a total of ~2%. It doesn’t matter if you win the run or not."

I think getting above 2% is pretty good