Basal foliage clumps of 'Goldsturm' makes it a frontal plant itself, as are hostas, daylilies and so on.

I had considered moving the Rudbeckia forward so that it becomes the frontal plant and instead planting something behind it. Its a large sized clump though so if I do go down that route, won't do it till next spring. Most of any hosta would be obscured by the hedge and not a huge fan of daylilies.
I haven't been able to settle on the right perennial to fit that spot thats why I'm considering a shrub. Currently has lobelia scarlet fan which is a beautiful red but is too tall and now flopping over.

I've got a suggestion... lovely little cultivar:
Deutzia nikko. You can keep it to any height you want, very easily. No problems with shearing it as often as you like because it blooms on current growth.

Dax

Miclino, my first thought was the same as Dax. I love my Deutzia gracilis 'Nikko'. They have beautiful white flowers in late spring and then the foliage stays nice and green with small leaves. It's a tidy little shrub.