Pete, the ones here that mature fast under sun and don't require to be protected do very well for rooting, just 2 weeks ago I took a branch from Burbank, where I used to go and eat Vista figs, the branch had started to grow already and had a breba on it too, I cut it anyway because it was the only suited one, brought home cut it up to cutting sizes for my zip-lock. I took the leaves for tea and discarded the breba. I already see some pre-rooting white spots on them, no mold or rot. I also saved the top green fresh grown part and put in cut of water to root, first the tips with tiny leaves went down then, but now they are all woken up, I think even that part will root.
*What I am saying is that , maybe, the reason the last grown shoots are a bit weaker because of the way they survive your winter. I hear you guys , when store them in garages, don't even water them or keep watering to minimum ...?
By the way, I thought your original question would be "when would be best time to harvest cuttings for rooting".
What I am noticing is that when cuttings harvested right before break of dormancy they grow roots so fast, because the levels of growth hormone reach their peak for dormancy break process. This is a very important point to consider for rooting success.