Hi Gene,
i dont know perfect answer about the container tree's just i go by what i personally do. I keep mine between 4 and 6ft tall and root prune after 3rd season in the late winter before they awaken, i say late winter because its to darn cold even in garage so i pick a nice day. I grow in tree form not bushy form.
IF i was to grow in the ground in area with hurricane threat i would surely grow in bush form and not tree form to have better chance of survival.
Other area's i would grow mostly in bush form and a few perhaps in tree form as i like the way tree form looks, but bush form gives more figs of course.
Fig tree's will keep on growing and growing if you let them, most trim them at some point to be able to reach all there figs, be able to winterize in a easy fashion, keep maxium sunlight shinning into the tree by cutting some branches, etc,etc.
How many figs can a large tree bear, more than i can eat and i have eaten as many as 30 in one day when daughter was away as its just me and her that eat them, they dont bother me like some folks with the bathroom and the latex and stuff i guess im lucky.But thats nothing compared to what a big tree can produce as you mention in your post, thats why some dry them as i have started to do and others make a wonderful jam preserve that i will one day learn how, along with cookies and the whole 10 yards. I remember my grandmas as a little kid she lived in chicago and she had 1 fig tree in a tree form and gosh we always had many many figs during the height of the season but thats another story. Just be carful about giving them away as they might come right back to you, example 1 year i was giving all the neighbors Zuchinni as i grew to darn much well after i kept doing that that year they were all bringing me bread they made with it and i got the hint as i had to start telling my daughter here bring this to school and give to your teacher!
Oh if you want to see some of my tree's for idea's in containers just search Dieseler in the search thinghy i have posted lots of pictures of my trees with more to come of some new types im trying that should bear next season.
I and some others also posted root pruning pictures also just type in root pruning also.There's another long story about that one to when tree limb poked me in neck last year and bloodied my shirt as i root pruned that tree i destroyed this year but not because of that but i do have a baby rooted as thats another story in itself and you thought you could ramble on!!!
I just enjoy talking and taking pictures and viewing others fig tree's as well when i have the time.
; )
Best Health