I'm no expert but usally shorter longbows have more R/D in them.And they will give more performance then a straight limbed longbow.And then you have your foward risers like Super Shrews,that design allows for a longer draw while having a shorter bow.Straight limbed bows I feel draw smoother when they are longer,with your draw length a 68"-70" would most likely draw smoother then a 64" straight limbed bow for you.You would most likely feel the shorter bow stack with longer draws.But a 62" or 64" with R/D come draw smooth with your longer draw.But like you say personal preference comes into play,I like a straight limb bow like Hill's.They may not be as fast my R/D bows but they can be a joy to shoot.