That does make sense.
I've seen better clumps from 2Cs and 3As than I do with 3Bs and up. There are exceptions of course. I've seen 3Cs and 4As with teeny corkscrews that would be considered clumpy for the typical 3C/4A curl diameter.
Then you have the mixed types, the 3a/b mixes like Hockeymom that get great clumps.
I think that it is just a little easier to clump/corkscrew when you have a larger curl diameter.
I can get corkscrews - sorta - and they tend to be a bit lazier and more loose if that makes sense. I guess those are more spirals than corkscrews. I also had them when I had short bangs.
ETA: I agree that it is easier to let the hair do its thing. I just have to stop being jealous of the clumpers, lol.