I use instant dry yeast Block form you get at sams club. I keep the bulk in the freezer and keep about a half a cup in the fridge. This is what i use to make bread. I usually pull it and use it right away but fail to get a good oven spring. My dough usually doubles when in its first and second rise but never springs in the oven. I know i dont need to mix it with liquid like the other kinds of yeasts. I just throw this stuff in the flour and mix all ingredients together.HELP!!!