The other thing to confirm would be to see if Kubota offers something like a wet bagging kit or trim ring that would modify the air flow. In a situation like this, it is best to talk to the dealer service guru to see if there are bulletins or accessories that may help. Be clear about what the shortcomings are. One thing that you will find is that there are less aftermarket offerings for Kubota L&G than say Deere or some of the other big manufacturers. IE trying another blade would be a sane thing to do, but if there are none available- then it is back to troubleshooting. I've had a couple of customers over the years that have had QOC or bagging issues with their Kubota that they weren't able to solve to their satisfaction. They all do. People's cutting environment and expectations are different. If you can safely drop the height of cut a notch lower, you may pick up more vacuum as well.