Is it just me or does Karma seem a little too oppressive in the early game?

In terms of the AP support role, she seems to function just fine like others (Morgana, Annie, Lux, etc...) However she seems to hurt a significant amount more than them. Her kit is utility based with impressive AP ratios and high base damage. But she also provides a ton of zone control with her Q, especially when buffed by Mantra. To me, she seems a bit too overpowering for the support role because 1) the Q has a relatively short cooldown but very high damage output for low levels (for reference it has 20 more base damage than Lux's e), 2) Her Mantra buff for the Q is near impossible to miss hitting at least the first part and is a very powerful zoning ability, 3) her tether is point and click with a very long range and 90% ap ratio and a root, 4) her E makes breaking the tether nearly impossible since hardly anyone can match her speed if she buffs herself, 5) the shield itself when mantra is used reaches 110% ap ratio making it incredibly hard to crack.

Ideas:

• make her mantra replace the damage instead of adding to it, but buff the stats overall so as not to compleatly ruin its usefulness
• make her W function like LeBlanc's tether but have it only collide with Champions
• decrease the bonus movement speed on her E (40% at level 1 is pretty high)
• allow her shield to scale ap instead of flat 50% at all ranks to make early ranks less strong while keeping higher ranks still viable, because 110% AP ratio (when mantra is used) at rank 1 is a pretty good for shield.
• increase her mana costs so she isn't quite as potent but not high enough to prevent spamming