If he were to leave his driver in the bag during casual rounds after hitting two balls OB and then starting hitting an iron off the tee, there would not be such a discrepancy on his posted casual rounds and tournament scores. By hitting "4-8 balls OB" playing a casual round his handicap is inflated. The OP is a higher handicap based due to being a very inconsistent driver. By completely changing his style of play in a tournament, his handicap is no longer an accurate assessment.