Protien skimmer?

[LafondReef]

Hello I've been running my system for about 5 years and doing great I think. I've been struggling with my nutrients and chemistry I feel the whole time.
I have multiple tanks on the same system. A 55g redsea , 40g breeder, 20g frag and a 40g sump. I seem to have good numbers in nitrates and then have barely any, then good then barely any.. this cycle has been a fight the whole time. The question I have is I'm running a deltec 1000i protien skimmer that is rated for a bigger volume system. The skimmer is amazing but I'm thinking it might be my problem being to big. Should I remove it and buy the smaller model 600i or would this not be as big an issue.
600i is rated 55-150
1000i is rated 155-250
Thank you for advice

 

[Mr. Mojo Rising]

Whats the issue though? Hard to comment on the nutrients if the nutrients not listed? Are corals unhappy? Is algae growing?

 

[LafondReef]

Whats the issue though? Hard to comment on the nutrients if the nutrients not listed? Are corals unhappy? Is algae growing?

I'm not sure I used nutrients correctly as in I have regular water changes cover that. my problem is my lps seems to struggle and I know I can't seem to keep my nitrates up or even balanced. I'm wondering if the protien skimmer is essentially cleaning to much? And how That factors into how the system levels out..