Mystic Aerial Assault with a Rod of Balance

[Ploppy]

Hi all,

I am uncertain how these two combine:

Aerial Assault:

Aerial Assault (Su)

You can charge at creatures in the air, or leap across obstacles as part of a charge. When making a charge attack, you can expend one use of mythic power to include a single Acrobatics check made to jump, adding 10 feet per tier to the height or distance you jump. You take no falling damage from the height gained as part of this leap. If your attack hits, you may deal an amount of additional damage equal to the falling damage appropriate for the height you reached. Alternatively, you may replace your melee attack from this charge with a grapple check. If you successfully grapple a creature, you bring it to the ground with you at the end of your jump, and it takes an appropriate amount of falling damage for the height it was at when you grappled it.

Rod of Balance:

[Unimportant stuff]...The wielder of the rod receives a +10 competence bonus on all Acrobatics checks involving long jumps and high jumps; additionally, the wielder covers double the normal distance for a jump when making an Acrobatics check...[more unimportant stuff]

My questions:

1) How is the jump distance/height calculated? Is it:
(Jump x 2) + Mystic Tier Bonus or
(Jump + Mystic Tier Bonus) x 2?

2) Aerial assault adds 10ft per Tier to the height or distance. How does this interact when the Rod of Balance doubles the distance only? Normally a jump apex is 1/4 of its distance. This kind of dependent on the first question...

3) Aerial Assault gives bonus damage based on the falling damage. How is this rounded?
For example, when my jump check gives a 44 (11ft height), is the bonus damage +1D6 or +2D6?

Thanks in advance for opinions.
Greetings