I do not take credit for this video, I found it and thought that I should share it. The other solution was not working out for me, and I tried this one and got it with the first try.
Edit 04/08/2017: I noticed a few things were unclear in the video, and people have commented a few tips.
"You need to hold the left stick backwards when in air, or you won't gain height when boosting/jumping."
"It's important to not waste the boost on the run up so when you jump you can boost a bit higher and then mash the buttons for a wee bit boost and then a wee bit more jump."
"another thing that isn't mentioned is you MUST HOLD THE GAS PEDAL DOWN while you're in mid air. So its jump off cliff, hold the left stick back, hold the gas button down, and quickly press X/A."
Thank you
Labtoy,
SuperAwesomez, and
The Schwartz 00 for pointing these out.