My question is do long bow need to be "long" to be smooth and precise.
At 27" draw? NO. I think you'd do fine with a longbow that's 58-60" long. I've found with my 32" draw that I can shoot pretty well with a 64" longbow, but 66" is better. 66" is just two inches longer than double my draw length. A friend of mine has a 25" draw and shoots great with a 56" longbow. The bow is short enough that he can put enough strain on the limbs to get good performance. With longer bows, he never was able to get very good arrow speed.