Pulled 2 stops. Worked fine. Maybe even better than nominal 400.
Easily compare recipes with the FilmDev Recipe Finder
All FilmDev Recipes
Foma Fomapan 100 in Photographers' Formulary Pyrocat HD
12 minutes at 20°C/68.0°F
Adox/Efke CHS 100 II in Adox FX-39 Type II 1+9
7 minutes, 30 seconds at 20°C/68.0°F
Adox/Efke CHS 100 II in Adox FX-39 Type II 1+9
8 minutes at 20°C/68.0°F