Look at all of the quick connect fittings as they will constrict the air considerable. Every regulator and filter will do some constriction.
If you have a Motor Guard filter, the media might be toast.
What size tip (nozzle) are you using with the different thicknesses? Are you in the ballpark of this post?
I ask because once I tried to cut 1/2 steel with fine cut and sparks were flying everywhere except in the water bed.
Photos of consumables and your setup might be helpful.
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