With a little help got it figured out for you! 
When getting the forward vector there should be a link to set the yaw as well for the Y value. Ideally the X and Y values should be the same. The further apart and offset your character is will shoot you slightly off to the side.
Using the following setup I’ve gotten rid of the X and Y value and instead made a variable that is the XY value:
In my test you will see that I’ve extended the arrow in the X axis with the scale to better see how straight the jump is for the player. This is a good way to test and see if you’re getting the results.
Here is a test Project I’ve made with the new setup. You can download it from dropbox link here: https://www.dropbox.com/s/f3dc90en6pp0uy0/JumpPadTest.zip?dl=0