BZB, for homemade chips I've been peeling and cutting into chips then soaking in water for about half an hour and rinsing until water is clear. Once soaked I then microwaved for about 10 minutes until partially cooked, emptied water and then dryed on a tea towel before placing in the fridge for the day. When cooking I sprayed with oil and cooked at 200 for I think 10 mins or until crisp turning a few times to ensure they were all nicely browned. This method suits me because I can make them to the airfrying stage before work and then leave in the gridge drying out during the day. The type of potato does have a big impact on the final product.