I would use the shea moisture deep treatment masque u can use it as a deep conditioning treatment or leave in, my hair is somewhat thick but its fine at the same time (if that makes any sense lol) but this product really hydrates my hair the only thing is its too heavy FOR ME and I feel it weighs my hair down my friend has more thick and coarse hair than I do and it really works well for her, based off of how u described your hair being thick and coarse u should definitely try it out if u havent, got mines at target heard they sale it at walgreens too