Yes, these should be good enough - the difference between a -500 at 45 tons and a -300 at 45 tons should be negligible. The -400 comes with stronger engines, so the landing distance on contaminated runways (where reverse thrust is taken into account) would be different.
I am unable to share my original data for legal reasons, unfortunately.
Right now it looks like a recent version of the simulator introduced the issue and Laminar Research are figuring out what happened. Hopefully we’ll see a bug fix soon.