5 Axis Plasma

And you do need a high definition torch for that, with normal torches the angle will be compounded by the lack of directional pressure causing the cuts to be even worse.

You can always try to raise the pressure up to 7Bar and see if something blows up or you get better cuts.
Can we see some pictures of the cuts you are getting now ?
As general rules:
-the torch must be perpendicular to the material, any misalignment will show on the cuts as slopes
-experiment with cutting speeds and cutting height, there is no other way around it and the charts are useless in most cases
-change the swirl rings often like a week or two if used daily and all day,
Additional info from experience with many types of torches:
-very often on normal torches the nozzle will end up very near the electrode due to tightening the cup to much and that will mess up the air flow, and short of changing the torch there is little that can be done, but there is ! Tighten the cup just till the nozzle can not be moved with a finger any more. To check the air flow from the nozzle while the air is on put the hand under it with palm facing torch, there should be visible dents on the hand skin where the middle of the torch is blowing. DO NOT TURN ON THE TORCH while doing this !!! Just the air, best when the post flow is still on and torch is disabled in PlasmaC.