I'm trying to figure out the change in knockback with Monado Buster/Monado Jump and what causes it.
Luigi Up B
Neutral Shulk - 69%
Jump - 68%
Buster - 65%
Shield - 114%
Smash - 58%
Mega Man - 72%
Captain Falcon - 72%
Lucario - 69%
Marth - 65%
Jigglypuff - 49%
King Dedede - 82%
Rosalina & Luma - 56%
Pikachu - 58%
Olimar - 58%
Duck Hunt - 67%
C. Falcon side B
Shulk - 122%
Jump - 128% - I tested this over and over... odd.
Buster - 121%
Duck Hunt - 124%
Yoshi - 118%
Mega Man - 130%
Lucario - 124%
Yoshi Up Smash
Shulk - 78%
Jump - 77%
Buster - 75%
Duck Hunt - 76%
Lucario - 78%
C.Falcon - 81%
^These results are more normal.
Meta Knight F-Smash, opponent all the way to edge, up close
Shulk - 41%
Jump Shulk - 36%
Buster - 38%
With the forward smash, it does 22% damage to neutral Shulk and 27% damage to Jump Shulk. I notice that the difference for kill % here is 5%. This may mean that the only reason Shulk has more knockback is because of the extra damage he takes (the damage after the hitbox hits is used in calculating knockback, not the damage before).
Meta Knight F-Smash going other way
79% - neutral
76% - Jump
76% - Buster
Here, you notice that Jump proportionally has more knockback than the others compared to the other one. This is probably because the large distance Shulk travels gives him a lot of time to be vectoring.
Okay, Bowser does 32% damage to Shulk with a fully charged F-Smash, 39% against jump. The difference is 7%, so whatever the kill percent for Neutral Shulk is for this F-Smash, Jump's kill percent should be 7% lower than that. The vectoring/air speed factor should be negligible because Shulk is not travelling far.
Shulk dies specifically at 22% in neutral. In Jump, he dies no sooner than 15%. That's a 7% difference! "This is a good result!" Since these percents are so low, I bet that Monado Smash won't even be killed. And... yep! Monado Smash survives until 16%.
Furthermore, Shulk takes 36% damage when in Buster, so the kill percent should be 18% if there's no weight change. Let's test that. Shulk's kill percent is 18%!
Right, so there's no weight change with the Jump and Buster Monado arts. Now that we know that, let's try to explain some of the previous results I had.
Luigi Up B:
Neutral Shulk - 69%; Jump - 68%; Buster - 65%
25.0% damage to Neutral, 30.5% damage to Jump (reads as 30), 28% damage to Buster (28.25). Theoretically, if there were no other factors, Shulk's kill percents should really be Vanilla: 69%, Jump: 63.5% (reads as 63%), Buster: 65.75 (reads as 65%).
In this case, Buster is actually about where it should be (I only know the recorded kill % to the significant figure of the whole number), but Jump is way off. This is usually the case. I had the opponent settings to control in training mode, so there's no way vectoring or DI made the difference. It's quite strange, especially with C. Falcon's side B. Maybe Shulk's horizontal air mobility being increased makes him go less vertically over time, changing the angle? Well... that doesn't explain why duck hunt is harder to kill higher than Yoshi with the up B, since Yoshi has both a higher weight and air mobility than duck hunt.
Well, at least we can conclude that being in Jump or Buster does not make you have very much more knockback than being in neutral. It's also good to know that they do not change your weight value and the extra knockback is due to the extra damage. This should have implications for how we treat the art in general.
edit: Now I've done some testing with that Little Mac stage spike that was found earlier. It only works on Battlefield/Big Battlefield and their Omegas and Wuhu Island Omega. It also works with G&W somewhat, but only on the omega of battlefield/big battlefield. I don't know if it works on any other character, but I tested any I thought it might.