u/Bscorp800

Hi, I'm a masters swimmer (28M) and have a biotype that people describe as on the heavier, muscular side (and not tall). Lower body is my bane and after some effort, I managed to keep my hips high on the water. However, my coach says my hips are very good now, but my feet are always on a lower level despite kicking (heels dont get over the waterline). He gave me some directions such as trying to kick shorter and mantain legs close together, but I still feel I'm not grasping his directions. Has anyone had any different insights about low feet with high hips?