here is something to think about.
when i started this fig thing, i got my first 3 trees from East Coast Figs. they were sent to me in fall. as soon as i got them, i put them in 3 gal container. by the june of next year, the roots filled up the 3 gal container and i repot them into 10 gal container. by sept. the 10 gal containers were filled. i didn't bother with bigger container. mainly 'cause when i did repot in june, yes repot, not up pot, i lost 1 month in the trees recovering from the shock.
next yr, i kept them in 10 gal. i meant to root prune, but i didn't. the figs were amazing. the taste improved 10 fold on one of my tree. other was washed out due to too much rain.
now.. spring of 2012, i rooted good number of UCD cuttings. they did very well. some are root bound. am i going to xfer them into 3, 5, or 10 gal.. i wish i can move them to 10 gal. if i had choice, i would. way i see it, first 2-3 yrs are basically for vegetative growth. give them ton of room for the top and roots to grow. if you get good crop, good. if not, wait at least 4-5 years to see what they will turn into.
if you search on White Greek, you will see great reviews. i trust this forum and the opinion of the members how has been growing the figs much longer than i have. last year was first year that my White Greek putting on the figs. it was more or less tasteless. not bad taste, not just bland.. it just didn't have any taste. am i going to trash this tree? heck no. it came from very generous forum member and i'll treasure it forever. i'll give it every chance i can. but beside that, the figs will improve over number of year. give it time.