New celerity idea.
Instead of giving x% mov speed, i suggest that it'll modify mov speed effects by x%. speeds will be more powerfull at the cost of slows getting more powerfull.
for example(celerity having a 10% modify value): hecrim's e gives him 75% bonus mov speed max. without the rune his movment speed will be 604 total(258 bonus mov speed) with the rune, it'll give him 82.5% mov speed. making his total mov speed 630(284 bonus mov speed). BUT sion's e slows for 60%. without the rune but with hecarim's e it turns down to 604 - 604x0.6 = 241 with the rune. 630 -630x0.66 = 214.
that means that even if the mov speed got better, the slow is even stronger than ever