Hillhopper,
I have a few limestone bluff areas that I hunt and find very nice seng in those areas.
You may remember this pic from my birthday hunt a couple years ago..
All of those big bulby roots below and to the left of that $20.00 looked to be in the 5-8 year old range. The tops were big and stout, some nearly 24\" tall, big 4 and 3 prongs, with huge berry pods. They all had short root necks, but good stress rings. My seng buyer sure had no complaints about buying them.
I found them on a limestone bluff. The dirt was just full of limestone rock chips and the roots were all big and fat and had lots of root hairs too.
The other roots to the right of that $20.00 were found in normal hardwood, north facing hillside, on the way down to the bluff. They were all in the 20 year old range and 8-10\" tall 3 prongs, had berry pods with 5-10 berries on them, and the roots were about 1/4 the size of those bluff area roots.
I think you are on your way to having roots like my limestone bluff roots, and in a shorter than average timeframe too for seng.
Keep us posted on the progress there. I can't wait to see those at 3 and 4 and 5 years..
TNhunter