Walk Behind Lawn Mowers

There seems to be a design flaw in the HU800AWD in what I will call for now the rear door baffle insert(the half moon shaped plastic piece on the inside of the rear door). It is the exact same size on the smaller mowers(which seem to be flush with the mowing chamber) as the AWD but the AWD has extra length in the rear body(probably to accomodate the AWD for the rear)which causes clippings to build up while mulching then drop out all at once. This is not right. It would seem that this model needs it own rear baffle insert rather than using the same one from the smaller mowers. Yes, I took it to a dealer to have it checked out and they said everything was fine other than the R.P.M.'s were a little low so they set them to factory specs. and they called Husqvarna about the rear baffle insert and Husqvarna's response to me was to send a copy of the tip sheet from the manual about not mowing more than one third the length of the grass and suggested trying to mow skinnier strips in the lawn. 1) My mower is set to 3 inches and I try not to let it get longer than 4 inches. 2) Husqvarna can NOT leagally advertise a mower as a 22inch then suggest to only mow 11 inches at a time(this suggestion was just plain insulting and does NOTHING to solve the problem), besides, I tried it anyways and it still does not help. Grass clippings still amass on the newly created rear shelf of the AWD mower then spit out randomly when the shelf gets full rather than evenly dispersing them like it should(but it DID leave only 40 piles of lawn killing spots of mulch piles rather than 80). So my questions are these 1) How can this be fixed? and 2) How do I contact Husqvarna directly when you have abosolutly nothing to offer to fix this problem? Even if a proper sized rear door baffle insert would impede clippings from going into the bag(which I don't think it would), a spring loaded version that would retract when the rear door is lifted should'nt be that hard to come up with. Forgive my frustration but I'm about at my wits end. I paid alot of extra money for this mower over other brands and models and my expectations of how it should work(as a mulcher in this case) are NOT way out from left field in my estimation, not to mention that the call center refuses to give out any direct numbers to Husqvarna or any useful advise in this case and even the dealer gave me the run around(they held onto the mower for about a week before they even called Husqvarna and ONLY after I called them back) and even lied on the reciept, they wrote "test drive in lawn ok".. There is not a single blade of grass on their property. I asked when I came in so I could show them what was happening but they said then that they did'nt have any grass yet still put it on the bill they they did check it out on the lawn.