While all of that is nice, she still lacks a lot to make her truly worth SR's attention. She excels in the smaller maps because she has all of that at a short range outside of her Q.
Her Mantra is very liner.
If you're going APC Q2 is your main ability, anything else is generally situational and a waste
If you're going tanky AP W2 is your main ability, anything else is generally situational and a waste
If you're going support(lol?) E2 is your main ability, anything else is generally a waste.
Now, if you're going APC Lux does just as well as Karma and at a much safer range.
If you're going tanky AP Ryze/Vlad works about the same. Although this is Karma's best roll(imo) and she does shine here.
If you're support... well you're silly and Lulu does everything you can.
I feel what Karma needs to be in the right spot is more Mantra options overall and a little more tools as a support.
-Give W a small %missing HP heal on an ally and a small base heal with that. Overall healing an ADC the same as Sona. Down side being it's a longer cooldown and doesn't self heal. Upside being it scales.
-Give W2 a CC reduction for it's duration on ally and remove all CC at the end. I don't feel this would be OP as most CC don't last 2 seconds.
-Give E2 a damage increase based on the missing health of the target when the target is a champion. 1% for every 1% missing for example. Bringing it up to a possible 1.2 scaling. It will still be less damage than Q2 but more reliable.
Now APC Karma can use Q or E for damage.
Now Tanky Karma can use W or E for survivability or damage.
Now Support Karma can sue W or E for supporting.
I'm not sure if this would really make her even more OP in Dominion as it's about using her Mantra for other uses. And possibly her W. As you guys are already working on champion numbers in Dominion, I assume you could just change what needs changed if it becomes a problem there.
TL;Dr Karma is very limited by the roll she plays to decide what she uses her Mantra on. As it makes other choices very week in comparison this makes is so other champions out class her. Tanky Karma is about the only roll she shines in and the one you've seen in the LCS.