I'm not Wizardplay (surprise!), but I can tell you that most of the BR's on venom are performed by using pitch and sideshifting to gain air. I personally have pitch set to motion control, but every player has their own preference.

After a while you get a feel for the bumps and grooves in the track, and thus where it's possible to exploit the track design to gain air. Most places where this can be done are already found and are typically the advanced BR's you see in many YT vids.

Only way to pull them off consistently is practice (and in some cases, luck).