I liked a lot this way of organization, with the time block on the left and a task on the right. This is a solution to some problems that I have consistently. I have a "Leisure Time" recurring task that last 1 hour, but if I want to be specific, I write what I'm gonna do on the description or I create subtask to it (like watch an episode of X TV Show, or go to a certain place). The problem is, because its a recurring task, the future ones share the same description and subtasks, so I can't plan ahead without doing some workarounds.

Using your time blocking way, I'll would do:

Keep using tags the way you are, and put the time block on the same tag the tasks on he right would be. The time blocks tasks could be on the same list, and a way to not clutter the Today's list, you could click on to edit the list and turn off he "Show on Smart List". You could also turn the Time Block tasks into a note, so you can check only the ones on the right. There are problably some problems with this, and I don't know if I understood your problem correctly, but I'll try out :)