Actually, according to the specs, the M44-7 should be the loudest as it has an output voltage of 9.5mV, where the DJ E has an output voltage of 6 mV. The shape of the actual needle has more to do with stability in the groove and tracking capabilities than with the output level.
As the are both the same techonology (moving magnet) and assuming you used them in the same TT with identical needle pressure, the same gain setting and the exact same track(s) (THIS is important if you want to do A-B comparison), one would start thinking perhaps you had a faulty example of the M44-7. Also you could have the M44-G which, like the Ortofon, is about 6mV output. But those would have had to sound as loud as the Ortofons then, which they apparently didn’t.
So, no, the needle shape won’t explain away that difference. Specs say the results should sooner be the other way around based on the output voltage.
I don’t know what to tell you here, perhaps another reader can shed some light (and enlighten me in the process).