have you been power cleaning much? for how long?
maybe you just havent done it enough?
i know in HS my best was 185 as a senior because id only done it like 10 times. in college i went to 225 not because i got outrageously strong, but because i simply started doing it more often.
i feel dead lifts helps my power clean the most. im not expert and there may not be a huge correlation between deadlifts and power cleans but i feel as one goes up so does the other.
i also feel my power clean transfers over to my sprinting more than any other lift in the weight room. so YES, i feel your power clean IS keeping you from running faster.