It's okay to over-fill demand (to a point, then diminishing returns increase exponentially). Your ratio is good for pure green pax, but, as mentioned above, you can exceed C and Y actual demand by a decent percentage.
This is true but on the bigger routes there is generally to much demand to fill and also have seats for blue pax remaining. What I generally do is make 21 weekly flights so that the frequency is decent and fill it with green pax, since this is the most profitable pax. That way, you have the most profitable planes.