Ok I think I can criticize these pretty well.
I can't really tell, but it does not look like your l-canceling jigglies aerials when you hit the ground, I hardly ever see you follow up any attacks because of this. And your approach is WAY TO SIMILAR. You do the same thing almost everytime. You need to mix it up. Don't always full jump double aerials, try shffl bair to uptilt, or shffl fair to grab, hell there is a ton of variations. Against Peach, remember she can't really go anywhere when coming back to the stage and your bair outprioritizes practically everything she can do as long as you space it correctly. So just puff your way to w/e height peach is floating and keep bairing to keep the pressure on. Marth edgegaurding is pretty easy once you get them far enough from the stage.
Learn to waveshield, it's a good tactic for jiggly to move around the stage and shield then wavedash to grab on laggy attacks. If you watch yourself in these videos, your too immobile. Try to move more and be more deceptive. Alot of times you will just full jump double aerial land and shield. Learn to utilize other moves such as the upair, uptilt, nair. Plenty of videos online where you can see this. In others words, don't make every movement an attack, movement in itself can lead to opportunities by tricking your opponent into an action you can predict. For example the Marth, like many other Marths often just approach via a shffl'd aerial. You would be surprised how easy it is to just wavedash backwards and f-smash, or simply cc fsmash at low percents.
For the team help thing. . . Yes grab to rest is nice and all. But your partner is FOX vs Marth and Peach. Upthrow to upair is Fox's friend in this matchup and he shouldn't be waiting around for you. I tend to rest more if the other person grabs and I'm nearby other than when my teammate grabs. It needs to be situational, not running across the screen trying to do it. Fox should be upthrow to upairing almost everytime. He shouldn't be hitting them in the throw either, grab to upthrow as fast as possible to try to catch them with no DI. On the other hand Jiggly grabbing to Fox running jc upsmash works extremely well. If they are at high percentages and your friend is accurate you should be doing this. As Fox is extremely fast and can do it quickly.
You guys play well, you just need to be more dynamic. Dash dance, tech chase better. One of the nice things to do with Jiggly is to upthrow under a platform, if you know they are going to tech all you have to do is predict which way they will go, if they roll or get up where you predict rest, otherwise waste another jump and fair or bair them. I'm sort of just going on here so I'll just leave it at that. 1. Don't stop moving. 2. Be more varied. 3. Tech-chase better. 4. Don't listen to Spot, Jiggly and Fox is fine, unless you really play well Fox and Falco is generally worse.