Hello; I agree if money is not an issue. You can never be too rich, too thin or have too much filter. Well I guess you can be too thin and maybe too much filter can have more current than the fish are comfortable with?
Hello; I also doubt this is the problem. Fifty years ago I ran tanks with only air bubble filters and such. Tiny flow compared to what we can have now. Again for those who pack the fish in and have very high bioload then big filtration makes a difference. I do not see this as your problem based on my understanding. Maybe I missed something.