What size are you printing?
Also, assuming you are using variable contrast filter, are you using contrast filters? While you can print without one and assume grade 2, exposure time will be very short. I always use filters even if it is #2.
Also, some paper are very FAST. Comparing Ilford MGIV and Adorama brand paper, the latter is about 3 times faster, so for small prints, exposure times are pretty short.
Is your aperture blade on lens working correctly and not sticking or stuck wide open?