Hi Danny,
You offering me a job! Seriously though, with so much time on my hands I might just try and look a bit deeper into this, but 3:1 also sounds about right from my personal experience.
Having read Lakey's post again, he as you rightly say, estimates 75% of the rifles were sold with with standard "Pistol Hand" stocks and his along with your own, is probably as informed an opinion as you are likely to get.
Regards
Brian