Posted: 03/10/2017 at 18:16
The 'slimy' potato is most likely the original 'seed' potato. The small holes could be from wireworms or possibly keel slugs.
You can apply a nematode control for these pests. It doesn't sound like you've done anything wrong, it's hard to know what pests your soil will hold. Wireworms are often a pest in newly cultivated soil so may not be such an issue in the future.
If you can post a picture of the damage then forum members should be able to help identify and suggest solutions.
The Charlotte potatoes will be fine to eat.