My concern with Kipper is that the Flames are horrible this year, and Kipper has been average at best. I do believe he'll improve, but in the meantime he's giving up too many goals and, if the Flames can't score, he won't win.
I selected Zajac for exactly the reason you stated--he centers the top line with two monsters. So far the results have been mediocre, and it sounds like Kovy is back at LW on the second line. So, that reduces his appeal a bit.
In any event, I think you're probably right about waiting it out. I probably just need to be patient.