I usually shoot raw plus B&W jpeg, so you may want to give that a try. I've found the B&W jpegs to be very versatile. In terms of recommended setings, many of us shoot our RX1 with focus separated from the shutter release. For example, I usually have the front control dial set to MF. My "c" button is assigned to AF/MF Control Hold; my AEL button to spot AEL toggle; my left button to AF/MF Control Toggle; my right button to Quality; and my down button to Autofocus Area. I generally keep my autofocus area set to center. With the front dial set to MF, I achieve focus by pressing the "c" button, and focus remains locked until I press the "c" button again. If I want to switch to AF on the shutter release, I hit the left button; to switch back to focus with the "c" button, just hit the left button again.
Another tip is to shoot in manual exposure mode with auto ISO. This allows you to choose your aperture and shutter speed, and the camera will adjust exposure with the ISO. Exposure compensation works in manual mode, too. The problem with aperture priority mode is that the RX1 will lower the shutter speed to 1/80 before it begins raising ISO, and 1/80 is, IMO, too slow for this camera. I try to set my shutter speed at or above 1/160.
I hope you enjoy your RX1. It is a great little camera.