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You might wanna try a larger one next time you do it and maybe the time after that. That should get them down quite a bit and from then on do your regular changes. I do massive water changes myself but not twice a week. that is dedication! Good for you!
Clown fish, diamond goby, snowflake eel, 6 chromies, fox face rabbit, cleaner shrimp, chocolate chip star, sand sifting star is the stock. I'm running the CPR dual pack HOB skimmer and filter with two Maxie jet 1200 and some Koralia power heads..
With that many water changes your nitrates should be zero. Are you using ro water if not the water your adding could be the source of your nitrates, also what test kit are you using if its api they always test high so your nitrates could be lower.