It hasn't even been 24 hours. Hold on there, tiger.
I find it amusing that out of hundreds of plants available to us, you cannot find anything to your liking in the midground. Such is Raul!
Both of the plants you mentioned are not great for the midground unless you're willing to prune them down twice a week. I don't think "Aroma" is available in the states (and why would it ever be used as a midground plant?).
Most stem plants don't look good from the side. They have to be pruned and tiered carefully for best effect. If you want something grassy, why not just try Isoetes? Slower growing, less maintenance, grassy effect, etc. Another grassy one would be Rotala sp Nanjenshan with its beautiful finely divided leaves, as I've said in an earlier post.
I feel that I must remind that when you place a plant in the midground --you're not married to having it there. It's not permanent. Mix and match species until you find what is most pleasing to you.
Carlos