I took screenshots to summarize the video.
https://www.youtube.com/watch?v=-YyNv2sar24&feature=youtu.be
Nothing
Standard
Set lets explain things from here on out:
Step 1: Account for angular changes in DI and where we would assume jiggs to be. Keep in mind perceived distance changes in this case are not actual distance changes as jiggs moves along a circle, where the radius would extend from Bower to Jiggs.
Step 2: Account for horizontal VI changes from holding up and down, keeping in mind that holding directly straight up and down achieves the greatest affect on VI as was the case in 1.02.
Up
Step 1: Greater Angle, one youd assume holding up for DI
Step 2: Greatest Distance
Up Right
Step 1: Virtually no change in angle, what youd assume holding up right for DI
Step 2: Greater knockback but less then holding straight up
Right
Step 1: More shallow angle, what youd assume holding right for DI
Step 2: No distance change
Down Right
Step 1: More Shallow Angle, what youd expect holding down right
Step 2: knockback reduction? (inconclusive)
Down
Step 1: Most shallow Angle, what youd expect holding down
Step 2: Greatest reduction in knockback
Down Left
Step 1: Virtually no change in angle, what youd expect holding down left
Step 2: Decreased knockback, but not as significant as straight down once the difference in angle from down is considered.
Left
Step 1: Greater angle, slight changed youd expect from holding left
Step 2: No significant change in knockback
Up Left
Step 1: Greater Angle, what youd consider from holding up left
Step 2: Greater Knockback, however hard to compare to straight up
If Im reading too far into these or seem to be mistaken feel free to call it out.
Now back to the normal users comments:
Order in terms of horizontal distance:
Up Left~Left<Down Left<Down<Nothing<Down Right<Right<Up Right<Up
General trend:
-Left is better
-Down is better.
-Up is not bad in the case of pressing left, but is bad in the case that you are not. Unless, of course, you want to go high, in which case do up left
-Right is not good all around
Something one person in the video was saying is that he thought jiggly was flying faster when it was tilted up. This makes sense with this launch speed data:
So I think it's determined by a combo of things: VI, DI, and launch speed. Launch speed is increased when you hold up and decreased when holding down. Perhaps this was added to decrease the effects of DI. I'm still having trouble figuring out how this all fits together though, and I need to go to bed =].