sounds like you have it under control
I agree that the water was abit on the hot side... something "luke warm" is probably best. (say 80-85F)
with the larger size of this container I think you could be best served using "water changes" to replenish your CO2 generator... by that I mean keep premixed suger-water on hand... when production starts to fall do about a 50% water change of your bottle using the premixed sugar-water.... this will greatly decrease the amount of yeast you use over time... and make sure that your CO2 generator bounces back very quickly from a refill... probably in an hour of less.
Thats a great idea for a container BTW... the one thing that you might watch our for is acids in the yeasts/CO2 affecting the rubber seals of the sprayer over time.
Take care,
-Justin
One Mynds Eye