I have such figure of VRTA as 2.6, after which check is required. And having hard landing expierence on other types I tell you that according to own feelings real 1,5 on others is more than 2 on 320. And sometimes it is opposite feelings. I would like to say that load report VRTA sometimes does not correspond to own feelings. You may land smoothly but VRTA is 1,5 and vice verse. It seems to depend on pitch change rate before touchdown.