Most inseason programs don't implement any lifting over 85% intensity on your big 3 (squats,deads,bench) and don't implement over 77.5% intensity on olympic lifts. Inseason, I would recommend never going more than 3 work sets, but 4 is ok if you are not in a competition week. A great resource for inseason lifting is Joe Kenn's book on the Tier System.
While strength can be gained during the inseason, remember that your primary focus is on field/court performance, so don't do anything in the weightroom that will fry your CNS and leave you "groggy" for competition. I would also recommend never lifting more than 45 minutes (not including WU) and not lifting more than 2-3 times a week inseason.