So it’s 200% WT4 bonus + 5% elixir + maybe 5-10% party bonus + the 8or20% ashes bonus = up to 235% extra xp in Wt4?
If so and my math is correct taking 215 to 235 is equivalent to 9.3%+ extra xp bonus (more if you’re not in a party/have elixir). Not a whole lot but it’s something noticeable at least.
I think game needs a way to make alt leveling more friendly through ways unlocked/obtained on your main. Such as buying special xp potions at max level, or finding gear with +xp, or some kind of gem like D3 had etc. Or some system that makes every subsequent alt level faster and faster - so many different ways to do something. So basically you have to grind hard for your first main and can then have fun with alts for the rest of the season - right now it’s not really possible for vast majority of people.