According to the XVM devs their WN8 is more reliable, because is not spoiled by a "troll" values from latest wn8 expected values v30 (created by wotlabs). I think we must live with this until they create new rating called WN9. There is some problem in calculating meds and some lights in new expected values, they could not solve it properly and set crazy high values for a few tanks. XVM didn't agree with that change and is still using v29, with few little changes, and it's called v29.1 or something.