Our Epcot strategy is to book one of the Tier1 FPs and the two Tier2s as early as possible in the day, get them out of the way then use the "one at a time FPs" for the other Tier1 attractions. if it's not a code red crowd day you can have a good chance of doing Frozen, Mickey M&G, TT, and Soarin with no issues. Illuminations FP with this method is hit or miss depending on how early you're done with FPs for other rides. I've never booked CL FPs so I have no idea if you have to burn all 6 before you can start your "one at a time" FPs, but it definitely doesn't seem like a good use of money to pay for the 6 for Epcot.