Horatio, are you keeping the MF pad 'clean' by brushing any excess compound from the pad after doing a section? The fibres can easily become clogged, so to speak and won't offer as much of a cut if so....
I'd say, done properly, you should gain an almost rotary level of cut using the MF system on the DA. You could always step up your compound as well, if still not getting the desired level of cut