Your teams obviously complacent when you play the smaller teams, try changing tactis for those matches and the players maybe play a few youngsters who have something to prove and will try harder in those matches. I won the league first season with rangers and the league cup, lost out in the semi's to hearts and got into champ league last 16 after beating barca 4-2, lost in the end to Real Madrid. I Used A 4-4-2, check what style of team your playing if you can beat them with the long ball or short pass them off the park.