Yes. The more I've worked on my form and incorporated Arne's video tips into my shooting (Moebow 1 on YouTube), the weaker spined arrows I've ended up with, for some reason. I am also shooting 1916s out of a 45lb recurve that are 28.75" long (not quite 28" draw, but very close) with 150 grain points. I have also put Woodsman broadheads on them and they shot exactly like the field points, so I feel confident that this spine is correct. I played with carbon arrows and was thrown by the fact that everything seemed overspined till I got down to CX 75 arrows, which seemed like they must be too weak. I found that aluminums were much easier to tune, personally.