You must be mowin' dead grass or sellin' ZTR mulch kits :laughing:
I would like to mulch exclusively, but I have experienced the exact opposite on my lawn tractors and push mowers. Mulching turns the grass clippings into a paste that clings to the deck and builds up like crazy. So, I side discharge. If I get behind on mowing and there are visible grass clippings left on the lawn I will give them a day or two to dry out then go back over with the mulch plate and the deck raised a notch. Mulching also works great for leaf cleanup in the fall. I don't bag because I don't want a pile of dead grass and leaves, and the city is pretty slack when it comes to collecting yard waste.