I might be retarded. I'm trying to do ace runs with seiun sky and getting actual high stats is absolutely miserable. Am I just dealing with average rng? I've been wondering if there is something im doing fundamentally wrong here.

Please walk me through the important steps of doing ace runs as you see them. My support card deck is likely not it, as far as i can gather from online sources. My legacies are overall "fine", especially the guest one. I am also sort of consistent with getting Groundwork from Sparks. Do I just need a 10-12 blue spark parent that ALSO fulfills the groundwork requirements? My blue sparks are shit on my own parent, but I got the Mile and Groundwork sparks. Is that too little? Even so I'm having a really tough time hitting even close to S and above on Speed and Power.