Huge. If you can do it. Tank/healer is your only option. Or tank + dps that can heal, in full BOA gear. It is going to be slower than with a group though. And you have to run to the dungeons.
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This is false. XP caps at 300%. Even BOAs dont matter, except they are good gear and level with you.
You are 300% wrong. I did this very thing myself not a week ago. I can confirm that exp bonuses do not cap. It was ridiculous how fast we leveled. We went from sunken temple all the way to halls of lightning before the elixir ran out. Overall though, not worh the time it took us to farm the 2 elixirs.