Sometimes I use tresemme naturals as a leave-in (today for example) works wonderfully.
I've used MOP daily conditioner, and I think its "just ok". Also I've used Suave Naturals Coconut as a leave-in, my hair hates it a a leave-in, but works decently for co-washing, although I need a lot of product.
Make sure you are not using too much for your hair. maybe thats why your scalp gets itchy.