Victor340 and RPM manifold testing

So, i have a question since we are talking flow here... Is there a reason to get nuts with CFM if you don't have the inches or plan to run the RPM that needs 330? I already figure OOTB TF's are overkill for me.. is anything lost lower down by not having huge CFM? Or would having massive CFM and not using it be detrimental below X RPM due to lost velocity?