yeah that's the way I measured the one time I did it, I run like .010-.012" lash.So I know this would totally throw a curveball at your documentation, but what if you measured the cams at zero lash. You can set a weak coil spring over the original spring if it's a complete head.
Then you get the fulllllll picture of how the cam works vs using a standard valve lash, and if someone runs 0.25mm lash you'll know what the duration change is. You also don't have to mess around with valve lash.
I have a spare 14.7mm Kyrk cam but don't want to ship it, maybe if I'm ever out that way.. I also have an RSI Stage 3 cam with one bad lobe that I'm just going to throw away with scrap metal do you have any use for it?