Dennis,
There are alot of different way to do the test, and the step tablet is the easiest and fastest way to perform (I did try other method, and believe me, step tablet is the best). If we have chance to meet up later, I can bring my exposured tablet and result, and show you the procedures, it is not hard to understand.
There are lot of people shooting LF in HK, in oldcake, including me, there should be at least 4 or 5 persons are shooting 8x10, but I might be the one who shoot most among them.
Also, I know another group of people (including 發哥), most of them shot LF, and more than 5 or 6 person shot 8x10 (one person even shot 7x17!!!!!).
So, I believe there are at least 20 to 30 photographer are shooting 8x10 or above, we are not alone!!!! hahah!
Jack