[imtringued]

Three things:

1. Never set a maximum number of reviews. It will create an unstoppable backlog no matter what you do.

2. If you have a huge backlog of like 500 cards then just hit "HARD" on 50% of them until the backlog is spread out over multiple days and you have a manageable number reviews.

3. Don't have too many young cards at once. Stop adding new cards after you have 500 young cards (exact number depends on how easy the cards are).