Re Ultra LEDs. To be honest am not sure as I didn't feel confident enough to replace all the LEDs myself. However, I have a good friend also in the hobby who refurbed my lighting replacing all the LEDs and add 4 more to each side. He built his own scrubber using the same LEDs. I will try and find out more from him and let you know.Plenty of people run their fuges 24/7 on a permanent basis. Give it a go untill NO3 levels come down.
Don't forget your scrubber is dealing with the daily feedings of the tank, which is what its designed to do. Your adding on the extra task of reducing high levels of nitrate already in the system.
What are these "Ultra LEDs" you added to your scrubber?