I talked to a guywho use to lift in the 80's( Nice guy) he said to try this...

No matter what your doing, find out what you can lift ..

20 times/reps
then 4 times/reps (most you can lift 4 times)
then 4 times/reps (like above)
then 10 times/reps (of something you can only do ten times)
then 10 times/reps (of something you can only do ten times)

This works very well...As used something similar when he was BB