Quote Originally Posted by Simonh82 View Post
...By this time it was about 1am and with my young son up at 6am most days, I tried to make a print at f22 15 seconds (my best guess from the previous test strip). The print was over exposed again. I am really surprised that I wasn't able to make a print even at f22, with a usable exposure time. I know I should have continued to test exposure before making a full print, but time was running out...
I know this feeling, backed up against a wall, just dying to see something...

Maybe you need a Neutral Density filter 2 or 3 stops worth. Short times when printing Medium Format to 8x10 is not uncommon.