How do you grow your phrags? Do you know (and can you provide) IDs on them?
You can repot a lot of the wet growing phrags at almost any time of year, from late winter to fall, regardless of whether they're blooming or not, and regardless of whether they have new growths or not.
If they're blooming, then repotting is likely to reduce the lifespan of the spike as you might expect, and generally speaking you might as well cut the spike and force the plant to expend its energy into growing.
The reason having a new growth isn't necessarily as important for repotting as it is with a lot of other orchids is because even older growths will readily create new roots, create new root branches, and even reactive dormant root tips pretty readily.
For the longer petalled crosses with caudatum and its relatives that prefer to grow without constant moisture, however, it's better to err on the side of caution and wait until you see it's producing new growths.
All that being said, I recommend holding off on making divisions. If you've got room, let the plants grow out. The bigger they are, the better they bloom. You'll see more spikes, possibly more flowers and branching spikes, bigger blooms, brighter color, and better shape -- basically everything improves as the plants get older and larger. Once you have a big enough plant for a couple multigrowth divisions, then you can consider dividing it. Sometimes plants will even self divide.
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