From your description it sounds like you might be moving too fast.
Here are the settings I use for my hypertherm. If you set your razor weld for 45 amps I would lower the feed rate to 70-75ipm to start and try that with all the other settings the same.
(Hypertherm powermax 85 45amp std nozzle 45amp 100ipm 140volts ph.15 th .06 pd .4)
Here’s some of the 8th inch material I was working with