The witch might appreciate kinetic cover since witches typically have few defensive options, especially at lower level (I'm playing a witch and I would appreciate any protection an ally could grant me, they don't, but I'd appreciate it if they did).
I would't bother with Slick, you'd be using a Utility Wild Talent just to poorly replicate a first level spell which doesn't seem like a good deal to me. Let the witch take care of crowd/battlefield control if it's something the group really needs.
Elemental whispers probably grants you the most bang for you buck. If you choose a familiar such as a greensting scorpion or the hedgehog you're pretty much getting the benefit of a feat right there (Improved initiative or Iron Will respectively) which coupled with Alertness nets you two feats. While the skill bonus isn't that great, if you take a raven familiar then you've got yourself a flying scout that can speak one language of your choosing and if it takes damage it just returns to your mind, there's no cost to replace it unlike a regular familiar so there's no risk in using it.
Between the witch and the cleric with their spells, hexes, channel energy and wands you shouldn't really need Kinetic Healer but taking it at some point isn't the worst thing you could do. Might save a life after all.