is there a reason you aren’t just using resolves burn in tool for all of this?
Adding a png keyable item just to add a box seems like a waste of processor power to me, especially when the burn in tool allows quite a bit of flexabilty with these items. You have individual clip burn in as well as timeline burn in, inclusing custom tabs where you can type what ever you want and have it burnt in.
As for your delivery problem, are you set to deliver individual items, or “single clip”. That will affect what is or isn’t seen on output.
If you are getting timecode from the wrong track, or the name from the wrong track, then you probably need to go to the clip tab within the burn tool, select the proper clip, and hopefully that will tell Resolve which layer you are wanting.
But again, i think the png is unnecesary. Just adjust the opacity of your overall burn inside the burn tool, this will drop the box and text opacity down, but will still be totally legible for the sound engineer. You can then just leave your burn tool looking at the overall timeline, and will probably get a faster render.
Glenn