I use Adox and Foma papers at the moment and my exposure times are measured in seconds. The problem is worse when splitgrade printing, since times for high and low contrast exposure get really short, shorter than my timer's precision.

I don't want to stop my enlarger lens below 3 stops (f8 or f11, depends on the lens) to keep it sharp. The head is colour with 12v (halogen) lamp, so no way to tweak the source either.

What else could I do?