Rainy day = Trap Building = Question

Finally got moved into the new house and putting the workshop to use on a rainy day. I'm building traps. For the main body I'm using 1/2" wire cloth making 24" long, 6 1/2" diameter tubes.



For the cone I'm using 1/4" wire cloth. On one trap the cone was 2 1/2" deep to the 2" opening entering the trap, and the other is 3" deep to the 2" opening.



My question: is there an optimum cone depth, or am I over thinking?



Thanks!