Architect Archive

So I built a bunch of large mineral harvesters last night for my the guild.. I got one pumping and its like 5.85 pull value.. where the mediums are 3.3. The large take 2 slots, the mediums take 1. Obviously 2 mediums = 3.3 pull vs a 5.85 pull.

So tell me aside from the math.. that looks the mediums are better.. do the heavys actully pull enough more ore then 2 meds?