Make sure that you leave your articles unpublished long enough to not show on Google searches. They will show as duplicate content, which no one likes. The Hub score comes from an average of your hubs and then other activities that you do on HubPages so unless you are taking all of your higher ranked Hubs off, it shouldn't effect it much. Usually if they are doing well, we leave them alone and just move them if they are not doing well, so your Hub score might go up. I hope this helps you.