Max attack speed and position

So i was playing kayle recently and i like damage. The only problem is if i want to utilize the full potential i have to almost be standing still with tiny gitters of movement in between attacks cuz they so fast. Should i sacrifice atack speed for more ap do i could have more time to reposition in between attacks? I remember riot saying they thought jhins weakness would be his lack of sustained damage compared to other adc's but carries spend more time repositioning without attacking that it didnt have a big impact. So im guessing max attack speed would be a waste unless you could just stand still and beat on enemies