just keep checking. its a feel and when you get the ppi the way you intend, you will get it. It's something that I have to reacquaint myself with every time I weave. It becomes a body memory, as they say. When I have made wool blankets at 6epi, it is very open and looks so fragile. But once its fulled, it locks the structure together very nicely and the openness of the weave is perfect in the end.