I'm basing my comments on the CLFP strategies thread here on TPAS. There are many reports of limited availability. It seems to be a different pool of FP, but it's not an unlimited pool of FP by any means. Otherwise, you would be best to pre-schedule none of them and just call when you want ride XYZ.
Aside from no drops, I have never had a problem over the busiest of times, including Christmas week. It does take practice. And I'm not trying to sell you on refreshing (which might not be long for the world, anyhow). But I think it's fair to point out that compared to what you can do by refreshing, CLFP is very restrictive.
In all honesty, if CLFP were free for staying CL, I would decline them. Well, maybe I would pre-schedule 1 of them per day only. At park open for a Tier-1 (or 7DMT).