Problems Cutting 3/8 flat bar

Has anyone been cutting 3/8 or larger on their pro? I have cut 1/4 with no problems at all on my original crossfire with Hypertherm 45 and machine Torch. I got 2 circles to cut but are beveled and then just piles of dross with very few times the torch cut all the way through. I was using a 30ipm feed rate and even slowed it down real time with no noticeable change.
I’m going to change consumables obviously and remembered the .2 springback that’s programmed into sheetcam tool. I was thinking I maybe need to slow down my plunge rate.
Is there anything else that I need to look for? I’m trying not to waste too much more material or consumables.