You're an experienced pilgrim, most likely you'll have no big problems winging it.
Since easter is in march, the first wave of spring pilgrims should already have rolled towards Santiago, and the second usually starts later, end of april/beginning of may. So you'll hopefully be inbetween the waves.
I've walked the Francés starting before and through easter in 2015 and it was busy but fine, then in summer 17/19/22 and it was still fine. Apart from the really very busy last 100km conga line from Sarria, I didn't find it more crowded in the later summer walks than the spring walk 15. Maybe even less so.
If you prefer to wing it, then do that. Would I start walking april next year, I'd do it as always, without reservations.
If for whatever reasons that doesn't work, you can always adapt.
In that case I've found same day reservations (phone call when having second breakfast or lunch) sufficient so far.
Buen Camino!