Tristana is too safe
Tristana has way too much safety with her W. Long range dash that resets on kills/assists is too much for an ADC that can trade and siege so well.
Just my suggestion, add a scaling range to it. At rank one, the range is short, and each rank it increases until it peaks at rank 5. This way, she can choose to rank it up for safety, or level her other skills for more damage, but losing the early safety due to shorter range on E.
