Walk Behind Lawn Mowers

I recently purchased the Husqvarna HU800AWD (the new all wheel drive walk-behind mower) and I am generally pleased with the mower's performance; however, I have one major issue regarding it's mulching capabilty. When mulching, grass builds up in the mower and it drops clumps of grass randomly in the yard. Looking at the design, it appears to be caused by an inadequate mulching plug that is built into the rear bagger door. The mulcing plug is much too small and allows grass to build up around the bagger door, which drops in the yeard periodically. It is really annoying, to the point that I can't mulch with this mower and I am forced to bag the grass. At first I thought it was because the grass was too tall, but it happens no matter the grass height everytime I mulch. My previous mowers (both Sears Craftsman) mulched much better and I beleive it was because of the design which had a much larger mulching plug that was a separate part. The mulching plug on the Sears mowers made the deck one complete circle and didn't allow the grass to build up like the Husqvarna. I have read several complaints about this mulching issue on the Husqvarna at various sites, including consumer reports. Surely, Husqvarna has come up with a solution to this problem, like an aftermarket mulching plug attachment or something similar. Please advise if you guys have something to fix this issue as I am contemplating returning this mower because it is so annoying to mulch with.