A seasoned shooter helped me figure out the problem at the range.
Looks like the length of pull is correct, especially since he corrected me to mount the gun prior to calling the bird.
However, the comb is just a tad too short for my cheek to rest firmly and comfortably on it for 4 rounds of trap.
He recommended:
http://speedbumpbusterprices.blogspot.com/
or
http://www.bosesguns.com/stockaccessories.html
for the best price/quality ratio.
Which of the two would you guys recommend?