Anyone else has been struggling to last hit as a mage?

Seriously since pre-season went live i've been struggling so freakin' hard to last hit on some champs...

I really wish there would be a rune to help you cs in the sorcery tree.

Bring back the mastery that added 5% of your AP to your auto-attacks.

That or a new rune like: Your spells and attacks execute minions that fall below a certain treshold (5 + 10% of your AP)

Seriously it's so awkward to last hit as a mage. Melee minions that should die from two tower shot + AA often survive. AoE spells that leave minions with ONE hp and then they instantly die to minions.

Sometimes you have to time your attacks INBETWEEN caster minion attacks because your AA doesn't deal enough damage to kill the minion, but the three incoming caster minion attacks will indeed kill it, so you have to hit the minion in the split second between the first and third caster minion attack.

AD champions don't have this problem since their auto-attacks deal more damage, and tanks can just tank minions waves to make sure they don't lose any, while also having a high base AD to help.