I see. I do recall having had problems with some of the 74s and some of the 76s in the past until I paid closer attention to all the documentation contained in the download -- in a nutshell:
Sometimes texture artists or those who upload packages don't include the appropriate documentation. Thus you'll end up with a model that claims to be the latest version according to its description, but if you look closely, you'll find that the model is actually outdated. In other words the fact that a file was uploaded only yesterday doesn't necessarily mean the model it contains is current.
Complicating matters is the fact that the 74s and the 76s have been going for years now, which means a so-called update could be referring to anything, yet the model you end up with is still the one designed for FS2002.
The 73s are up-to-date obviously, let's see how quick they'll be updated for FSX if necessary 😀
In conclusion make sure your 767 uses the most recent .mdl and .air files and hopefully the landings will become easier.