CNC Oxy, cutting parameter

I have just finished building cnc oxy with no THC. Can somebody here give a clue the best parameter (pierce height, cutting height, pierce delay, preheat, feed rate, plunge rate) to cut with cnc oxy ? I put cutting height 2,5 mm, pierce height 5 mm, pierce delay 120 s, preheat 10 s, feed rate 2000 mm/m, plunge rate 200 mm/m. When I dry run, I did not see the time for pierce delay 120 s this long. What’s wrong?