I'm not familiar with your ballast, but from what I know of people with those type of ballasts they end up running the HQi setting.
For color later on you may decide you want to try a Radium bulb as well............ it's also designed for an HQI ballast. For now though, what you have should color and grow coral fine.
Read this link, it will help you better understand what I'm talking about.
Scroll down to 250w.
https://premiumaquatics.com/articles/radium
Whoops sorry, my mistake, I was thinking SE bulbs. You have the DE Phoenix bulbs which are fine. They have a long history of successful coloration and growth of acros. I assume you have the glass inserts/splash guards in place?
On the 450nm LEDs...........it's not that they are bad it's just that any singular spectrum can have a diminishing returns effect. People will go overboard with this and it can cause problems. Not every acro likes/needs 450 blue. Many pigments and chromo proteins color up/grow better under various other spectrums.