Back in post #3, I can not see the attached "cc".
I can not see the big picture.
You have a PC power supply that makes 12V. (What does the 12 volts measure?) Many PC power supplies can not make 100 watts at 12V when there is no load on the 5V and 3.3V.
Then there is a DC to DC boost supply. (need more information) I think you have it set to 33 volts output.
Next you have a LM338. What is the input and output voltage? How hot is it? Can you hold it in your hand, hot?