i suppose that we need to look at one reference only, can’t be comparing from many sources. It’s essential to have just one basis, and stick to that one. If you search on the internet , and on the messages I have already written in an other discussion, here there are many factors on why there are a lot of differences between ACARS in flight simulation. In my opinion I would prefer a G-Force reference instead of a fpm value. About MSFS2020 I see not much differences. I also have a third party widget installed and is pretty much similar rates.