Not sure if this helps... But my baby is also 11 weeks and I keep her on more of a 7-7 routine so when do her dreamfeed at 10/11 it's been closer to 4 hours so she seems to gulp more (I breastfeeding so I don't know amounts) and usually makes it through until 7. That being said, I think this May be the start of her 12 week growth spurt and she woke last night at 5 for a decent feed and was hungry again at 7.
I'd watch to make sure her feeds are erratic- meaning hunger not habit- and maybe have more space between bedtime feed and dreamfeed (although Tracy says dreamfeed must be by 11 or it interrupts nighttime sleep cycles, she also bases this on a 7-7 routine so I don't know what to do with one that starts and ends later)
Hope this helps a little!