If you have two identical days, use FL on the first day to get all the rides, the second day you don't have to worry about anything because you already did all the rides. Just go at your own pace.
Thanks for all the advice everyone. Our plan will be to probably use the FL+ on Sunday, but we will do early entry and assess the queue situation before activating FL+. The weather looks pretty decent on both Sunday and Monday (albeit a storm may be in on Monday night). Will be very hot thought (heat indices up to 110!!)