I've been trying not to arm bend. I tried using straps to relax the arms, i slowed down my first pull, i tried complex like halt clean dls + cleans, clean pulls + cleans... I tried a lot of things, but none of that made this problem disappear.
The biggest concern I have with this, it's the arms being used as a 'reverse curl' and not going high and outside like an 'upright row'. Last saturday I did cleans from the floor, and in the last repetitions I focused on keeping the hook grip a little longer, and although my arms did bend yet, the pullunder felt very fast and agressive.