You can't stack all those. You can do 7 day, combo, pet, adventurer and jewlery. You cannot add the single 50% xp or a 25% xp elixir to the stack.
Personally I wouldn't use eggshell band, since removing a pile of stats just slows you down so each run takes longer. Since it only has a "chance" at bonus xp, I would rather do faster runs and skip the chance.
Last I checked, experience sharing wasn't working (This was last September / October and I don't know if this has been fixed). I can't run full party tests at this point because my toons are capped, and my alts are not planning to level up.
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