I wonder...what makes more "noise" underwater....a thin tail/claw....or a thicker tail/claw?
Based upon my experience with spinner baits...bigger blade...bigger thump...
I also noticed on some of my really big Northern Pike grubs...they have very thick tails...and a LOT of thump!
So... if the fish are feeding visually in clear water...more motion (like the tails on the swim fry!!!!) makes sense.
If you are fishing off color water....more sound would catch more fish.
Anecdotal experience this spring during the high, muddy water was that stick baits (like the 6" carrot) were NOT catching fish! But my Mad Dad 3xl (thick claws)....was pounding them. I also did well with big single tail grubs that you could feel coming through the water.
This fall, with very clear water...the 6" Carrot was tearing them up...especially when I molded it in medium or soft.
I'm just getting into hand pour (I'm hand pour challenged) and I just got one of CCMs hand pour craw molds and I made some up last night in medium...and then added 6 drops of softener to get more action. I'm testing them on Thanksgiving when it's forcasted to get to a balmy 53 degrees!
My 2 cents worth....