Ryze is gated by minions
Duh. Of course he is, every mage with a linear skill shot is gated by minions on some level. But is Ryze gated TOO heavily by them? The majority of Ryze's damage output comes from landing E-charged Qs. When Ryze is forced to fight when the enemy has a minion wave nearby they can duck into, Ryze is put at a disadvantage most mages don't have to deal with, because they can usually clear the waves hyper fast. Ryze has set up his E on the entire wave and then blast it with a Q, but the time that takes to do is very significant, and minion waves are very finnicky, forcing Ryze to put himself into awkward spots just to cover the whole wave in the charges.
I'm not trying to call Ryze's rework a failure because of this, in fact, it's because of the visual update to his theme that I've been playing the champion so much more. But I feel like this kit has left you with little to no levers to mess with lest he become way too strong. Maybe if the root became a skill shot that couldn't pass through minions, you could turn the Q into a pass through ability that hits everything on its way through? I'm sure there are many ways to go about making Ryze feel better as a champion, but that's just one suggestion I have.
tl;dr Ryze is put at more of a disadvantage in a fight with the presence of an enemy minion wave than other mages are