Can we make a list of fastest 1 shrooms with the premis that most tracks (MKSC) will be a shroom strat 1-1-1. We can use that as another guide towards potential times and therefore god/legend/king etc.

Mushroom Cup:
Peach Circuit  
Shy Guy Beach  
Riverside Park
Bowser Castle 1  

Flower Cup:
Mario Circuit
Boo Lake
Cheese Land
Bowser Castle 2

Lightning Cup
Luigi Circuit
Sky Garden
Cheep Cheep Island  22.41 with bowser
Sunset Wilds

Star Cup
Snow Land
Ribbon Road
Yoshi Desert  
Bowser Castle 3

Special Cup
Lakeside Park  
Broken Pier
Bowser Castle 4
Rainbow Road