Malachite Prism has struggle here too and it has had full sun in a not so crowded spot. I got it in 2009 and it multiplied very slowly. A friend of mine wanted a start, so in 2018 I gave her some of the 10 or so fans. Then it went into decline and I thought I had lost it, but it is starting to come back. I hope it makes it this year.
I guess I can only say that the reason I keep it is because of that awesome eyezone, because bud count and branching has not been very well and I don't believe it has ever reached its registered height of 36". I've seen 2-way branching mostly on it with only about 8-10 buds. I have never seen rust on it. Here in southern Indiana, we are not supposed to get rust, but I guarantee you we do some years.
With its beautiful eyezone, it is easy to distinguish. And many of its 42 children have that wonderful prismatic eyezone too.