Not enough disagreement in the transcripts to form camps. These are the positions taken by people with demonstrated expertise on this topic first, then by how many people heard them on it, then by VoiceRank.
KSI Olatunji claims that landing flat with the back wheels is the successful technique for clearing the stunt race jumps.
“I just [ __ ] landed flat each time like a bowler.”
KSI · Aug 2016 · 2 episodes · 2.7M views on this topicVik Barn suggests that bouncing off the side walls can reduce the speed of the vehicle to successfully land the jumps.
“Bounce off the sidewalls to reduce your speed then land flat like well back.”
KSI · Aug 2016 · 2 episodes · 2.7M views on this topicJosh Bradley observes that rally cars in the game perform better on downhill sections than uphill ones.
“So, this car bangs downhill but is terrible uphill. Just so you know.”
KSI · Aug 2016 · 2 episodes · 2.7M views on this topicHe notes that executing backflips with the vehicles in this specific game mode causes them to float.
“if you back flip you just float you just float”
KSI · Aug 2016 · 2 episodes · 2.7M views on this topicPositions are extracted from transcripts by a model and may misattribute who said what. Every quote links to the episode it came from.