Hi there.
We are currently on our 2nd trip with the CLFP. We have found that the earlier in the day we use them, the better, for 3 reasons:
1) they block you from being able to get other FP during those times; and
2) you’re more likely to use them (i.e., not get tired and want to bail on them even though you paid for them, lol); and
3) yes, you might be more likely to get later return times for the headliners if late FP are all that are left for them.
So given the options you laid out, for our family we would choose option 1. However, some people (our family and I think
@GADisneyDad14 for example) choose to have the CLFP be first so that you are “done” with them early and can modify the rest to your heart’s content (my family often strays from plans in the afternoon). And as long as you’re trying to move up your next “standard” FP time as soon as you tap in to each ride, we have found that we can have really great success at getting many FP+ beyond the initial “standard” ones...even for headliners.
HTH!