I'm not sure where they are now, but they said at the end of the final episode the lowest they got was 3.1. Yeah, if they don't make some big changes in how they approach things, it's not likely they will get much lower. But they made some comments about knowing the right things to do (we'll see if they are "right), but if they just stick to a plan for a whole year and stop looking for quick fixes it will be interesting to see what happens. It's entertaining.
They do seem to have an obsession with shooting par in a round, no matter the differential.