Repotting Phrag. Cardinal needs help, leave in s/h or go with a bark mix?

[Becca]

Hi Everyone,

It's been a while since I have posted anything on here. I'm hoping to get some help with my Phrag. Cardinal. I have attached a couple of pictures. I have had it in s/h since I have had it which is about 4 years or somewhere around there. Anyways, the growths never seem to do so well but the roots seem to be great in the s/h. I admit, I am horrible at fertilizing and I went for about a year, maybe a little longer without fertilizing my plants, but even before that, this one just seemed to be ok. It did bloom for me a couple of times, so I guess I can't complain to much. I'm just wondering if I should leave it in s/h or if maybe it would be happier in a bark mix? I did clean up some rotted roots, but as you can see it has a decent root system that does not equal the size of the growths it has. Also it always seems that the tips of the leaves are turning brown which I don't understand with the lack of fertilizing and I use RO water. Please let me know your opinion, or if you thing something else might be going on, perhaps to much light?

Edit: Sorry I forgot to rotate the pictures before posting them!