If the queue isn't clearing then you'd want to increase the number per batch, wouldn't you? The scheduled task only runs once every 10 minutes, so if you decrease it to 10 now you're only sending 100 per hour. (ETA: I think...unless I'm missing something about how it works).
You could also try going to the scheduled task manager and pressing the "run now" button next to that task and see if you can decrease the queue.
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