Adam, the process you describe sounds like "sweating". The ammonia and other compounds in the leaf are changed or expelled by the fermentation in the pile. It's basically forcing the leaf to age. If it works for your location and needs, it's good.
One question, are you pulling the stem when you roll the leaves? Most fermentation I've read about is with the center rib removed. This allows the rolls to be cut without disturbing them. I'm not sure this is always the case, but it is mentioned often.
FYI: If you add sugar or molasses to your rolls you've got old time chewing tobacco. Just cut a plug and chew. The soldiers in the civil war were known to chew till the sugar was gone, save and dry the "wad" and smoke it in a pipe that night.
Glad those times have changed...
I lean toward the older ways when I can find them, so here are a few historical links.
Dark curing and curing Perique
http://www.saveseeds.org/library/books/Tobacco_Leaf/tobacco_leaf_1897.html
A booklet from 1881. Curing info toward the end.
http://docsouth.unc.edu/nc/cameron/cameron.html
A fertilizer company booklet from 1915. A little commercial, but still some good info.
http://docsouth.unc.edu/nc/tobacco/tobacco.html
Here are the best instructions for building a home curing chamber I've seen on the net. The fellow who built it is gone now, but his family has kept the info up on the web. Good info on the whole site. He is curing already dry leaves like a burley. The process for Virginia bright or "flue cured" is a little different. The leaves are pulled from the stalk as the dark green color begins to lighten and the leaves ripen. The leaves are then hung in the "barn" and the temperature is raised to around 90 deg. F. The flow of fresh air is dampened till the humidity is around 70%. This will cause the leaves to yellow and the sugars to intensify. After the desired color is reached, the temps. are raised gradually to 170 deg. F to dry the leaf and set the color. When the stems are dry and dead, it's ready to cool down and let the humidity rise so you can handle it. Ready to use at this point, but ageing will only improve it.
http://www.coffinails.com/curing_tobacco.html
I like this forum. Pretty good info.
http://www.howtogrowtobacco.com/forum/index.php
That's probably more than you wanted, so I'll stop now.
If you need more info, just let me know.