If a product is showing a margin of 60% using Produtify figures, yet when eBay is checked, the price has dropped to be very close to that on AliExpress, should we disregard it and move on?

Yes, you have two choices here :

1. List with your margins and see if you get any traction. Remember, eBay is not like Amazon (a race to the bottom). Very often, the listing with a higher price and better optimization sells more.
2. Simply move on.