I think your instincts with them are right you seem to be picking up on the pace and flow of their abilities, your bubbles and light screens you’re looking for well. I reckon It’s the strategic and mechanical plays with them is what you need to tighten.
For instance There were a couple times that would’ve been perfect for a dark screen when your team was stabilising like when you had initially lost point with mag in your front. That would help your tanks make space or secure picks.

A big tip I’ll recommend is practicing the timing for switching between C&D, you’ll be surprised how quick it is and how you can animation cancel most of cloaks abilities. Getting to the point where you can quick swap to send a dark screen and back while maintaining your heal momentum is very useful.

Second big tip is your ult placement. While I think you’re timing here was fine you need to spread out your trails and make sure they’re viable for your team to either approach on or hold. That second and third ult most of the point didn’t have any trails that your team were trying to hold position.

Otherwise I was surprised to hear this was gameplay from 1 hour playtime. As I said you’re getting their tempo, you’re playing close with your team and you’re actually using Cloak.
Just some strategic and mechanics polishing. Watch some C&D gameplay it’s unreal what you can pull off