I think your splines look super rugged, beyond the strength of new. Not really discussed here is that the grain in the spline runs differently than the grain in the neck, so the same force applied would act differently on the neck and splines, gaining huge strength.
Personally, I would want some type of wood spline as Steve is doing on my instruments, I would NOT want carbon fiber. I know carbon fiber is currently all the rage, and I do like it for many things. BUT, people forget that it is not actually the way it is called. It is not "carbon fiber", it is "carbon fiber reinforced plastic". In other words, it is plastic! No plastic structural material in my fine instruments thank you! I'm old enough to have seen all types of plastic become brittle over time. Wood and steel can be almost forever if cared for.
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