I'm hesitant to let my 1100cfm Jet dust collector bag get more than 1/2 to 2/3 full or else it will lose efficiency, or become a hazzard. I now have clear bags and the whirling dust particles look like any higher they would come back out the impeller. Am I wrong? When I empty it I always have wondered if I let it get closer to the top I wouldn't have had to do it as often and it wouldn't have been such a PITA. How full do you guys let it get?