CAUT

Good question....  I've learned to expect slight discrepancies in ratio measurements when using different methods.  In theory it doesn't add up and I've spent much time scratching my head over this problem. The difference you are talking about is not small. Those numbers range from one extreme to the other. All the details of your measurement process would have to be exactly reviewed to comment on what went wrong but both can not be right. Common sense tells us to trust more the results from a real life set up with hammer blow, regulation, and key dip.  I use Dale Erwins simple ratio gauge but it is easy to get an incorrect reading with that as well, if the keys aren't level or if there is a lot of lead in the keys to begin with.  A small error in placement of your measuring device can add to a significant variance in ratio readings. Some actions also vary from one end of the keyboard to the other, or between sharps and naturals.  Proper regulation also makes a difference.  I spend a lot of time in my initial analysis process to be absolutely confident I am working with correct information to avoid surprises later. I hate surprises.   No doubt some others on this list will give you more information to consider, but set up as real a situation as you possibly can.  It matters less what the original setup was, then exactly what you will be getting with new parts.  My own mystery is explaining some of the slight differences we find in isolated notes even after everything is done to exact specifications with brand new parts.  That difference however, is indeed very small.  

Hope that helps,

Dennis Johnson