Originally Posted by Ridin' Green
After checking to make sure everything is running correctly (rpm's etc), try a lower lift blade than what you are running now. You hit the nail on the head with your post regarding many bagging problems. Too much blade lift in thick leaves and/or grass can over power the blower fan sometimes. Also check to make sure that you tube doesn't have something inside it that is causing an airflow issue. Last, and this may sound insane but it happens- make sure the blower fan belt is routed over the drive pulley the right direction and that the fan isn't actually spinning backwards from normal direction of operation.
Yeah pretty much agree with this. Make sure the belt isnt twisted and try some gators.