I would bet this is a yeast problem.......always bloom your yeast in a portion of your water before adding it into the recipe; the temp. of the water needs to be between 95 - 108 degrees to get the yeast going; if it exceeds 110 it will kill the yeast and if it lower then 88 it will not activate the yeast properly. The high gluten flour is what you want for a bread product of this type; I would recommend King Arthur flour as it has the highest protein content of mass marketed flours (protein translates into gluten strands as it reacts with the leavening agents). Now as for the dough hook is concerned, if you do not have a hook I would suggest mixing the dough by hand. Dough can get overworked by a paddle or whisk type mixer and this causes the gluten strands to contract and tighten up resulting in a dough that has no elasticity. If you mix by hand, mix the dough just until all ingredients are well blended then let the dough rest for a short time......this step will give the gluten strands time to recover from the mixing process. Make sure you let the dough rise in a warm moist environment......cooler, drier environments are not conducive to active yeast formation.
I hope this helps......this is a shortened version of a basic baking lesson about bread!!!