To me nightfishing and daytime fishing are two totally different worlds.
At night we bring the fish to us with our lights, even though we try to find a "comfortable" spot for the crappies to come to.
Daytime is different and I move quite frequently then.
As pointed out before, many times my larger fish will come very randomly. I might catch 15 10"ers then slam a 15" one later on.
I would probably think more of the waters you are fishing. There are some places around here that typically produce smaller fish.
For instance; Shearron Harris. You can catch all you can put in a cooler there, but they don't have much in the way of size to em.
Jordan has had smaller fish too with the occasional good un thrown in, up until about last year. Last year I was catching my limit easily in just a couple hours. Two years ago, I threw back a lot more than I was able to keep.
This year, I seem to be getting a LOT more 8-9" fish (throwbacks). I'm still getting my limit. It's just taking a LOT more time to do it. I'm no expert, but I believe it's a matter of not that many generations of fish there.
At night, I very rarely move more than once, if that.
"Be Ye Fishers of Men" You catch them- He will clean them