Ha! I actually knowingly copied Birdorf's setup as my first attempt was even worse! Rode the whole wall section each lap, jump boosted everything, hit each boost pad on the hill, no major bumps or whatever. Still utter toilet times!
Maybe it was coins. Didn't fetch 10 until the 3rd.
You can watch the ghosts of friends to check what they did (and race the ghosts), a look at the world record on YouTube will also give you an idea what to do, but some short cuts might be costing time if you can't nail them each time.
I might be back on this, nephew is coming over in two months and he's practicing the WiiU game and will beat us (his words). I'll see if I can have an half hour at nights, MHW before bed doesn't work for me.