I try to make a frappuccino like Starbucks has with the same syrups and same ingredients and it always comes out with ice chunks. I looked on YouTube and theirs comes out really well but I don't think blending is the problem. I tried two different blenders and blended them for different times. When I blend it for too long it comes out watery and I I don't blend it enough ice chunks are in it. Can someone please help me?