As I mentioned below, I have seen eggbinding or reproductive failure in nature, but as mentioned, very rarely.
I do not agree with what you attribute the captive causes too.
As I have mentioned until I am blue(rosy) in the face is. Wild reptiles live in a range of conditions. That is, a range of temperature, a range of humidity, a range of depths from the surface. A range of exposure to air, ETC ETC ETC ETC ETC ETC.
Yet in captivity, they are offered a winter temp, and summer temp and a set humidity. Three basic areas, Yet, We have more fingers to count with, but cannot remember to do so. In REALITY, they have hundreds of different levels of need.
AS MENTIONED A THOUSAND TIMES, in our studies, all snakes do their stinking entire lifes is move from one to the other. They DO NOT pick a single perferred temp or humidity. They use what is most efficient for each task.
This lack of choice is cause of our captive failures. You must also consider, lack of choices often is the cause of failures in wild populations. In fact, its a huge cause. AS most individuals do not fullfill their needs and perish.
Diet does not seem to be a big factor, as long as they recieve sufficent food. Also in our studys we found that different populations of the same species can concentrate on a different base prey item. An example would be rock or ridgenosed rattlesnakes that have rodent a rodent based prey source tend to contain larger individual snakes. Where as, if the same species as a lizard based diet(one of our sites does) the adults are much smaller. But without question, both populations exsist and reproduce without problem.
So if rodents allow your snakes to grow like weeds, and it does, then there is no reason to question rodents as a diet for reproduction. As there is little doubt that for a snake to double or triple its entire body structure takes a superior diet to reproduction. Normally reproduction is not a cause of stress, except in captivity where we do not allow choices.
The reality is, we in captivty have done a great job of obtaining a middle of the road set of husbandry rules. But it surely does not compare to wild animals that can obtain a need simply by moving 10 inches in any direction.
For instance, last sunday, we found several individual females who were in their post reproductive shed. Their temps were in the mid twenties C. Then we found a female who had a recent prey item in her stomach, and ovum for next years recruitment. She we in the mid to high thirties C.
The point, we find that their temps are DIRECTLY related to NEED. NOT to some caresheet. That has to be understood if you want to break away from the cart(marginal captive husbandry)leading the horse(the actual wild natural snake) The reality is the horse(the actual wild snake) always leads the cart. Cheers