Absolutely...
You'll be able to tell when you start to slow down when moving up in weight. A good way to test your speed within a dynamic workout is to do what we did for speed bench last Sunday. Up the weight five or ten lbs. every set or every other set and maintain your speed. Also, about every 3-4 workouts work up to a heavy single to test your speed. However, you don't want to fail. I would say the absolute maximum would be 90% of your 1-rep max and 75%-85% is best. There's no need to wait until you max. Also, don't work off of specific percentages; it's too iffy. You should be able to tell just by feel how your speed is going. Your speed may start to fall off at 65% and mine may fall off at 50%. It's an individual thing.
- Screwball