1. Could be the strings the demo came with. I just restrung from the 16 gauge multi to my normal 17 gauge poly and am hitting tonight, so we will see. I definitely was previously not getting the same lift or depth, but I didn't love the 2018 because it was too much, so I am happy with the 2021 so far.
2. When the ball contacts the racquet, it definitely sounds and feels more dead. Not in a bad way. Just audibly and also less jarring. I would call that muted, but that's me. Also because it seems to have a little less power than the 2018 to me so far, I can hit a more controlled ball, and I have better touch with my volleys and drop shots. Maybe I am confusing touch and feel?