You need to know the mA output at 30, 40, 50, 60% etc. If at 90% for example, you’re only outputting 20 or less mA, your power supply is not adjusted correctly.
OR
Since you said this started only after you installed a new controller, then make sur eyou check the controller’s manufacturer setttings for min and max output. Set this min to 10% (usually the floor for a 90 / 100w tube) and set max to 100%. Then adjust the Power Supply trim pot so that 100% PWM to the laser PSU isn’t over or under driving the tube.