how to manage duplicate listings

I am a high volume seller 1700 listings on ebay... I am struggling to manage duplicate listing, even thought I search for them to update the inventory or quantity when new stock comes in, if I miss one and relist by accident I get a strike.... Just wondering if anyone has any ideas of how to manage this easily and effectively.... Honestly its spinning me out, ebay are offering no help, their policy is to remove the listing and issue a strike... So anyone who can help would be greatly appreciated.