Ryze's early game MS boost + Shield is too strong
Ryze scales well in the late game, but it's hard to take advantage of his early game because of his self peel. Currently he gains a large 25% MS boost and 65 HP shield at level 1. I think a good change would be lowering the early values to 20%, and 47 respectively while keeping the max level bonuses the same. This way Ryze has to decide to invest points into Q, rather than getting large buffs with only one point in it.
So his late game remains strong, but it takes more work to get there. Just as a late game champion should be. It gives the opposing laner a bit of an easier time trading without being dominated from the beginning.
I know the win rate is a strong argument for against this change, but it this will mainly effect upper levels of play where they really take advantage of this early game and push advantages afterwards. A good Ryze still controls the lane very well.