Shiny:
I usually start taking villagers off of berries when I hit the period button and a villager is waiting to pick berries in a bush that a few are already at. When they start to cluster and there are only 1-2 bushes left I will have them build a second pit and have them chop away.
Like wedsaz says, you need more than 5-6 fbs to support your economy.
I have found that each Medit game I have to evaluate things around 7:00. I might have to get another land food source, I might do 4 docks, I might Tool attack on land... there are many things that ultimately affect how hard I boom and how fast I Tool.