How bout giving Garen more Q movespeed boost
Garen has the issue of falling off too hard in high ELO, but is also currently too weak in general. So how about we increase the short movespeed boost he gets from activating Q? Not in terms of duration, make it remain short, and thus requiring more strategic thinking to use, just make him go faster. After all, as rule n°3 of videogames states, "gotta go fast".