This is fairly typical with low cost plasma systems that are not designed specifically with the torch being used.
All Hypertherm systems are designed with the torch they are sold with....the power supply timing includes ramp up current and air flow at the beginning and end of each cut.....slightly different at different amperage settings. This allows for much longer consumable parts life in the Hypertherm systems....easily offsetting the higher purchase price over time. With Hypertherm air plasma torches it is common to have over 1000 cuts with good quality on one set of consumable parts.
Pictured are typical cuts from a Hypertherm Powermax45. 1st pic is 3/8" (9mm) steel, 2nd is 3/4" (20mm) steel, 3rd is 1/4" (6mm) steel with holes, 4th is 1/2" (12.5mm) steel, 5th is 1/4" (6mm) steel.