If you are wondering about odds. This is the sheet I use. If my math is wrong, which I don't think it is, as I had a few people double check it, feel free to let me know. I don't know where you got 8% though.
That chart's based off a chart of individual rolls odds for certain numbers, IE, the odds of roll say, 19 exactly with 4 dice are 4.32%. To get the odds for a specific spinner blitz number, you simply add up the odds all rolls above and including that number.
Hope this helps anyone curious about Spinner Blitz odds.
EDIT: It's a bit messy, and doesn't black out impossible rolls, so keep that in mind if you see odds of 0%.