Remove Garen's W Stacking cap
Garen's in quite a bad spot statistically right now in higher brackets, as he's been for quite some time.
http://lolalytics.com/champion/Garen/ (Diamond+)
http://champion.gg/champion/Garen/Top (Plat+)
A very simple fix for Garen's problem is to remove the stacking limit on his W.
This will reward Garen for making it to late game, sharpening his identity as a late game champion, while preventing him from obliterating lanes and snowballing in Low ELO.
I don't think this is unreasonable, since most games Garen won't have too much more than 240 farm which would be 30 additional Ar/MR, and his early game (where he's most vulnerable) would be completely unaffected.