Hello...I think we need some more information from you before we can respond!! What is it that you are working on?? Where did you get this Caron thread that is "kind of heavy"?? Did this come with a kit?? Ordinarily, you would use two strands of thread for 14 count Aida. I think where you have lost me is that it is somehow thicker?? Most companies who produce the thread that we use to Cross Stitch maintain a certain "size" to the thread so that it is easily interchangeable. (I am just a Stitcher in this chat room.)