Your fired hulls appear they were skived. The plastic does retain some memory, and will still exhibit a slight inward roll, which needs to be conditioned before de/repriming and sizing. Several suppliers sell a tapered aluminum tool which does a good job at this. plunging the tool (in the drill press) and holding it for a few seconds, to generate heat, brings the hull back to a reloadable condition.
Paper hulls retain no memory so this isn't an issue.
The only plastic hulls I reload are trimmed to 2 1/2", so 2 3/4" once fired hulls loose the skived portion, and all the new plastic I load are either purchased, unskived, to length, or trimmed to 2 1/2" from new 2 3/4" purchased hulls.
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