The higher the Pressure Support (PS) is, the easier it is to breath in and out.
Pressure Support is the boost in pressure which takes us from the low pressure used during exhalation (EPAP), to the higher pressure used during inhalation (IPAP).
When we start to inhale a "bilevel" machine like yours boosts the pressure (adds Pressure Support) and this helps us fill our lungs more easily. As inhalation ends, PS ends, and the drop back to a lower pressure makes it easier to exhale. A drop in pressure during exhalation is sometimes called Exhalation Pressure Relief or "Expiration Pressure Relief" (EPR). PS and EPR are like like two sides of the same coin.
So, a higher PS will make it easier, both during inhalation (during the pressure boost) and during exhalation (during the pressure drop) to breathe in and out.
I suggest setting the Min PS to 2 or higher. But I suggest not increasing the Min PS setting by more than 1 per night , because it may take a night or two to get used to the feeling of having a higher Min PS.
Also, as was mentioned, it sometimes helps (makes it easier to breathe in and out) if we use a larger size nasal pillow.
Also, because it is common that when the pressure is too low this makes us feel like we are getting too little air, it sometimes helps to increase both the Min EPAP and Max IPAP pressures, together, by 1 or 2 each. This increases the pressure without changing PS.