As a "recovering" 6-day Hopper buyer, just another thought:
If you are buying a full-price 1-day ticket to make it 6 total, be sure to check the 1-day variable pricing calendar. See if any days of your trip are Value or Regular price. If so, buy the 1-day ticket for THAT day. It can be any day of your trip.
This won't apply to Summer or holidays (all peak pricing). If going after September, you can't see the pricing calendar until it rolls over your dates. But you can google to see historical pricing to get an idea.