I have thick, coloured hair - really thick almost wiry individual strands and also lots of it. I am ok curling my hair with my tongs to get that curled, tousled look. It looks lovely when I first do it but within an hour or two some of the curls drop and it goes really frizzy. What am doing wrong? I don't have any specific products I use apart from my heat protect spray and a split end cream that I put on when my hair is damp. My hair is mid-length, down just past my collarbone.