BudLight, My Toro is built the same. I'm thinking the same thing its built that way to lift the clippings up through the bagger. I have the same problem cutting between mulch areas that one side is going to get hit with clippings. Right now, I'm using a leaf blower to blow them out but when I get my bagger it won't blow in the mulch areas. That part of my yard I'll use the bagger and take it off for the rest of the yard. I do think a company name Ballard makes a chute blocker for the Toro time cutter with a notched deck.
Mower Blades - Ballard Inc
www.ballard-inc.com