One thing that really annoys me with Lux's new shield

It's that to maximize its effectiveness on an ally, you have to be a very specific distance from your teammate(s). This means Lux doesn't just have to space herself from the enemy, but also from her TEAM. If she's close to her teammate and shields them, it takes a while for the baton to return, really reducing its effect.

How about making the first pass a bit more front-loaded? Something like... 60% of the full value on the first pass, 40% on the second pass.