I would say, looking at the chart, that you had a near perfect night. There is nothing there to be bothered with. Average O2sats of 94% is pretty common, and even a little mucous in the nose could lower it even further, so don't worry, it is a healthy reading. A lot of factors can effect the difference between 94 and 97%, including formation and size of the nasal cavities, the respiration rate, mucous flow, and nasal wall collapse (not that much of a factor in nasal pillows, since the pressure of the air flow through them keeps the walls from collapsing too much, and one reason I went that route rather than a mask).
You heart rate indicates your arousal state, and will vary over the night as you move between various levels of sleep and semi wakefulness. The pressure is more likely a response to your breathing pattern, but have a look and see if there are events clustered around the same periods as your increase of heart rate - the pressure rises in response to events or near events, and these events will change your sleep state, and thus your heart rate.