Ornamental Grass SOS

I need some advice on a Stipa arundinacea (also known as Anemanthele lessoniana) which i have in my garden. I grew some from seed a couple of years ago and they are now mature plants. I recenly needed to move some of them and one which had grown particuarly large and had outgrown its space, needed dividing. Whilst the other moved plants are looking fine, this divided plant (in its 4 divisions) is looking particularly sorry for itself despite incorporating compost into the planting sites and watering them well. Compared to my other plants of the same variety the divisions are looking a bit 'thin' and have lost their colour. They are planted in the same spot where the plant has thrived before (open, sunny spot, well drained soil etc) Could i have done more harm than good by dividing them? Is there anything (such as cutting them back) that i can do to help them recover or do i have to just wait and see what happens with them?

I would appreciate any advice please. Whilst I am an expereinced gardener i am a novice at growing ornamental grasses.