If both (or all three/four) of you know whats going on then that is fine, but if not all of the crew are on the same page then there is potential for a further layer of confusion. Whilst I also know the rough setting for each of the major flight regimes, I will follow the QRH....then everyone knows what to expect and can feel more comfortable in the procedure.
Of course if someone forgets to check the library and QRH is not on board...it can be useful to know what to set!!.