Maybe I'm crazy but regardless of which system you supplement with... isn't growth and consumption the goal of a reef tank? I don't see people talk about THAT. It's always stability bleh bleh bleh.
I have the same challenge with my aquarium. Every week I have to increase the AFR dose. We live on opposite side of the spectrum (my tank is 20 gallons vs 150) but have the same "problem"
Honestly I don't see it as a problem at all. I view it as an indicator to a very healthy reef system.
Everything is growing (weekly) and I have to add more supplement to support it.
I don't want flat numbers that stay the same. I want them always slowly drifting down due to usage. I want my coral growing and demanding more!