Wondering if anyone has experience with this system in the mulching mode that you would share. This is the FRS (Fill Reduction System) that uses adjustable baffles to partially block off flow to the blower inlet in order to mulch some of the clippings and send the rest to the hopper. Any idea what percentage of the clippings is actually mulched? Plugging issues? Can an older non-adjustable deck be retrofitted? Thanks for any help.