I'm curious about your whole experience. It seems that you are a bunch of smart people cooking up an awesome startup. That's why I want to read more.
You mention doing a fixed-price bid project. Could you expand on that?
Our sprints are basically at 2/3rds utilization and we've reserved the right to take a couple off-weeks between sprints over the course of a 4 month project. This gives us some strategic leverage in picking up attractive small projects so we don't have to completely close up. It also gives us the opportunity to do full sprints on our own product if our MVP tests, developed during the 2/3rd sprints, look good.
That being said, flexibility does not mean half-assed. We're doing our best work whether it be for our clients or our customers.