Have your shoulder charge primed and ready to use as you jump into it before you hit the end of it tap lift and then shoulder charge when you're directly over the top of the Vex pad the turn it heroic and boom you'll land right on top and you'll be there ready to make it a heroic as soon as the pathways are opened up
Apparently this bug is caused by having the game at over 60fps. If you're running the game in windowed fullscreen simply alt tab after jumping into the pad, this immediately caps your fps at 30. Saves you having to hard cap to 60