Could the geosynchonous incidence of Moon toward Earth be a factor?
Also, measurable impacts at both polar limbs are nonexistent.
That’s my guess. I think the earth is shielding the moon from some of the impacts. But you’d think it would show up as a fairly circular area that was relatively free of hits. So why there’s also a lack of observable impacts at the poles stumps me. Perhaps most of the meteoroids come in along the ecliptic, which is oriented in such a way wrt the moon that it shows up as fewer strikes near the poles??? Total WAG.