LD has never been defined against a certain metric. i.e. at x speed less than y cm going off straight line.
This is why everyone and their mother claims to have LD shafts.
Of course, the industry is less than willing to define a certain metric.
There actually was an older list floating around with actual measurements of multiple shafts, but I cant seem to find it anymore.
I'd say, you can get better shafts than the Meucci.
11.X shafts are always fun!