Got a 21" silverpro series with a 6.5hp duraforce engine. One problem I have with it is that it blows clippings out of the left side of the deck and they collect at the rear left wheel and leave a trail of clippings on the lawns. It is really bad in thicker grass. I have tried running it without the mulching fan, just the blade only and it doesn't do any better. It seems that the deck needs to be vented more to improve the air flow. There are 3 or 4 small holes in the deck and I assume these are for airflow, but they don't seem sufficient. Any comments?