A couple days ago I talked to someone at Elite, to ask if their specs on the Rezult (40-70) was the adjustment or a range that covered different limbs. They do have a few different limbs and in the course of our conversation he did say that it is best to pick limbs close to your peak dw rather than turning back the the dw more on heavier limbs. That said, due to the context in which he said this, I think he was speaking more from traditional thought than current data or data on this specific bows testing. More like if I want to shoot 50# i would be better off with 55# limbs than with 65.
I have seen posts on this forum about people backing off a few lbs because the arrows they are shooting like it better. If I was really convinced that shooting with my limbs cranked all the way down, the question then come up of whether I would also want to build the perfect arrow for that weight and other aspects of my set up. For me, the answer would be no. I'm just not that picky, at least not where I am at in the game.