You made me realise that this might be a function of planning granularity, since I have the opposite problem and never (ever) run full plans from the top down any more, as I started getting better results without it since Fable dropped. I'm cutting features into high level slices instead and having subagents work on the slice and hand back to an orchestrator.

The slices are usually a bit too wide. I terminate subagents at 200k and get them to handoff to lead. It works pretty well but again, it's hard to get the orchestrator to size the slices a bit smaller.