See, once the pattern gets in your head it gets easier each time and making a different size button doesn't require new instructions because you can see what you need to do.
I personally don't care much for tape as a foundation. I generally use another knot typically with strings through the body of the object (they don't slide then). I have used florist tape some though and shave it to shape. I have also used the epoxy putty. Don't know what kind of tape you are using but the florist stuff adds a little bit of weight as it is fairly dense.
You could switch to rawhide instead of roo, it tends to be heavier on it's own.