I have been running the mulch kit on my Lazer HP 52" most of the year this year. I have noticed that in some cases (more often than not) it leaves stringers and poorly cut grass on lawns that are not thick. The poorly cut grass seems to be directly in line with the spindles on the deck. On lawns that are thick and lush, a smooth level cut is produced. My blades are razor sharp and deck is ALWAYS clean. I know that this is an airflow problem. The grass that is light is being blown downward from the blades when the blades pass. In heavy grass the deck is sealed and works properly. I have done everything including dropping the deck a little lower in thin grass to get a better cut. Is there any cure for this?