How to fix Tristana's ultimate

Tristana's ultimate combined with her W and long range makes her nearly impossible to get on top of her and kill her. I suggest reducing her ultimate range from 550-669 to 450-569. If she wants to use her ultimate to burst someone she has to get into melee range to do so which leaves her vulnerable. And if she uses her ultimate to disengage she has to put herself in a dangerous situation first. She won't be able to peel off assassins while they aren't even in range to pose a threat to her. Also Tristana shouldn't be allowed to attack during the animation of her ultimate. As a squishy, 4-5 attacks from Tristana are enough to kill me and I'm forced to take ~2 hits while not being able to do anything.