With two other predators in the pond to eat small YP, keeping a viable perch population around without restocking is likely to be a bigger problem than having to remove any small YP.
You should probably see how the YP population does in the future to decide if you want more or less of them. Either way, I suggest placing some branches (big end out of the pond) in the water around the shore at the time of ice-out as spawning structure for the YP (they might be big enough this Spring, probably a surer thing next year). This will let you help increase YP number IF that turns out to be needed, but OTOH will let you remove the branches with YP egg strings if you want to decrease their numbers in the future.
I've no experience with Crappie ponds, so hopefully someone else can talk Crappy number control in greater detail than "if you have too many, fish a lot and remove all the small ones you can."
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