Slimmer recommendation

Hi,

I'm looking at upgrading my skimmer for my 178 US gallon system and wanted an Elite skimmer.

I kind of fall between the 150 and 200 INT. my concern is when I add more tangs, the 150 might be too small and currently the system won't produce enough organic s for the 200 to skim properly.

What would be your recommendation?

Thanks
Andy