The picture above confirms what I found from the access you gave me. Your problem is that your site is not busy enough to keep the vb cron system running - it needs regular visitors (not spiders) to keep it running. As you can see from you picture, its only managing to run the schedule very sporadically (about once an hour in the day, hardly at all at night).
About the only thing you can do is increase the batch size, so at least when it does run, it processes more. Try something like 200.
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