Maybe I can help a bit?
A friend threw some clones outside this year (during the last week of August about) and had one big fat cola all the way up the stem come the end of flowering time. He said he expected a bit more than a quarter out of each. The whole thing was a gag... just to do something with extra clones other than compost them. The one difference between your experiment and his... He DID have them in the propagator first, and the plants were fully rooted healthy plants. Basically they were plants that were ready to veg, but instead were put outdoors during the fall. Also, he takes big clones and vegg's to 2.5-3 feet, so these "clones" could be considered full plants to some I guess, however they weren't terribly old.
I put four two week old sprouts under 12/12 before and it took weeks for them to start flowering. Even then, theres no way the colas would have filled in like my friends clones did. It's gotta be hormones in the clones making them think they are older then they are - thus if you root them good and flower them, you should be able to get a "small" amount of dense bud.
Who's up for keeping a couple 6 foot mothers and vegging giant clones for a couple weeks before flowering them. You could probably get a 1/2 per if you mastered it.