Excellent response Cody. Your biology background shows here.
I've mentioned seasonality when discussing the feeding of boa constrictors. Gus Rentfro and Vincent Russo have always stated boas were not designed to eat year round as they follow a seasonal pattern, often of feast and famine. Your point about migration in this thread echoes the same. While it is true retics are very large or can be, they don't have to be total monsters all of the time. There are obvious variables involved but your advice here is perfect IMO.
Every one of your retics, even your big ones are beautifully lean and healthy looking.
Captivity and human feeding schedules play a big role in total size of these animals.
I'd like to see some video updates when you have time.