After a month or so I ended up with this one~
http://i.imgur.com/xUllyCw.png
I fed it only G3 food from rank 1 - 50 using MGP.
I seem to have hit a stamina problem and I've tested different things, hold W entire race, let go when Lathered hits, let go of W and wait for speed to almost drop all the way down then hold W.
While doing this I avoid all stamina related items but again the same problem happens, I run out of stamina around 70~80% progress of the course and the NPC overtake me and I drop down to 6-8 place at finish.
I had some mixed results but holding down W entire race and keep myself ahead enough so when I do run out of stamina, I am so far ahead that the NPC just wont make it past me before race finishes.
The NPC seem to never run out of stamina at all like the player even when I hit them with multiple Bac. water during a race and I am the one who run out of stamina first.
