Gatling combo is really good. Anything to land his upsmash is good because it does like 20%. The landing hitbox of dair even goes into upsmash, I used that yesterday and it was awesome. On the topic of DACUS I hate that it doesn't work out of Dthrow tech against characters with worse techs. You just fly past them, but the good is that you can downthrow tech chase a character like Squirtle or Toon Link for hours because their tech makes them near unplayable as you repeatedly grab them. As for Dthrow > jab > whatever, some characters can avoid all follow ups by SDIing the jab into the air and away. I've had characters like Jiggs, Olimar, and I believe Pika to escape before I could hammer them or even grab them in some cases
People need to boost grab more, it's so dumb. It beats CC and can work on heavies for a little while. It's main use is on shields though because if you catch someone with it like twice your opponent shields more cautiously.
Upthrow + side throws are really good because everything is the same so they have to always try to tech and in doing that they can forget to DI. If you upthrow and they DI to the side they end up lower to the ground and landing things like SH nair can be even easier at higher %. I am finding that upthrow goes into any aerial on a lot of characters, pretty much all at 0%. I've used it on Snake, Yoshi, DK with some success. It's just dumb against Fox, Falco, Wolf, Roy, Lucas, Diddy. The spacies fall a little faster so having some % on them sends them high enough to nair, at 0% they will hit the ground before it's out so just CG them for however much percent and throw the way you expect them to DI against and they go nowhere.
What are people doing at the edge to get back on? I try to ledge drop below an advance then rising uair > ledge regrab or just UpB through them and tech chase them on a platform usually. I have face opponents who have CCd or reacted to these and I die. I find characters with significant disjoint difficult to get back on stage against. Roy, Marth, Olimar, Ice Climbers do dumb stuff with the frost breath and the mini glaciers.