Kc, I really do think it is the pH in my case. Everything it seems deficient in so far points to that. For now, I am attempting to remedy with some fertilizer for the growing season (a band-aid solution), and I got my hands on some mycorrhizal fungi which I tried to apply to the roots as an experiment. We'll see what happens. Later I might see if I can adjust the pH using sulfur or something similar.
For your kiwi, I am not sure, but perhaps planting it will help. It certainly wouldn't hurt to look at pH requirements and possible amendments when planting.
May you enjoy many kiwiberries in the future!