Your "want tos" are just "shoulds" with a slightly-more-permissive name. You may "want to" finish 13 plates but is there a minimum number of plates you "must" finish? If there is, then that number of plates are a "big rock" and they need time allocated in your schedule. Otherwise plates (some or all of them) wait until the need for them increases or they float toward the bottom of the list as a "want to".