So the problem isn't just to do with less flow, but also that the FMICs block the radiator, right? Also, is there a reason why you didn't mention the MASSIVES in the list you provided? I had assumed that they are the best SMICs based on the flow charts posted by Ash not too long ago.
My main question is, if you were to compare a FMIC to a SMIC (if both flow the same), would the SMIC be the better performer?