I still don't really know what to do with my sparks
I default to getting stamina sparks on my umas since that's the most important stat
But then my other stats end up underwhelming
Is there a formula to use sparks on your umas?
i.e. full stam on sprints, stam and power for mile and medium, speed and power for long
And for that matter, should I even bother with O compatibility? Feels like my worse inheritance but double O beats a perfect 9* spark but single O