Chris Hooker emailed about something else and mentioned this. He strongly suggest I try some flats. I’ve found this video so will try some form of cereal bag flats later in the week; I probably won’t use a cereal bag, but something along those lines.
https://youtu.be/M7rSOXWQDZM?si=A6BESGiqf-UoXE5V
Thanks for the replies. I am feeling hopeful again.
James