Brooke - I have not had any success with lengthening Zara's night to over 11 hours, 11 hours is a good night, 10.5 is probably average. It is worth a try though.
Zara does sleep a lot less than average though, as you know - she is probably only at around 12-12.5 hrs per day. We have periods of longer nights, and I always think, this routine is great, I will stick with this, but in hindsight, it is usually a growth spurt, or a catch up from being extremely busy (and therefore missing a heap of sleep, like when we go away or something).
Unfortunately, we are still having plenty of early wakeups due to when DH goes to work, so we have had to bring bedtime earlier again, to compensate. We were doing OK in the middle of winter, but as the days get longer, having Zara sleep through him leaving for work just isn't happening.