My stature is 5 foot, 4 inches. I use the second position on the Sport II's adjustable stock and it works for me. I can't identify with anyone for whom the longest position on the Sport II is still too short.

But, if the stock is too short, logic says to add an extension.

And then take time to thank the Great God of Heaven that you have the "problem" of being too tall for the 6th position on the stock (as well as the "burden" of all the other societal privileges that come with being tall).