There's not much of a difference, weight-wise, between Ittok and Ekos. The arm which is widely believed to over-compress the right rear spring is the SME V, which weighs ca. 750 grams to the Ekos' ca. 400 grams, IIRC.

I don't have a weight for the Aro to hand, but when you factor in the arm cabling, I think there's not much between Aro and Ekos.